139431500 has 96 divisors (see below), whose sum is σ = 345508800. Its totient is φ = 48729600.

The previous prime is 139431493. The next prime is 139431527. The reversal of 139431500 is 5134931.

It is a super-2 number, since 2×139431500² = 38882286384500000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 139431500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122936 + ... + 124064.

It is an arithmetic number, because the mean of its divisors is an integer number (3599050).

Almost surely, 2^139431500 is an apocalyptic number.

139431500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139431500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172754400).

139431500 is an abundant number, since it is smaller than the sum of its proper divisors (206077300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139431500 is a wasteful number, since it uses less digits than its factorization.

139431500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180 (or 1168 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 139431500 is about 11808.1116187136. Note that the first 3 decimals coincide. The cubic root of 139431500 is about 518.5456155214.

It can be divided in two parts, 139431 and 500, that added together give a palindrome (139931).

The spelling of 139431500 in words is "one hundred thirty-nine million, four hundred thirty-one thousand, five hundred".