139581900 has 144 divisors (see below), whose sum is σ = 475282080. Its totient is φ = 35020800.

The previous prime is 139581881. The next prime is 139581907. The reversal of 139581900 is 9185931.

It is a happy number.

It is a super-2 number, since 2×139581900² = 38966213615220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (139581907) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 44380 + ... + 47420.

It is an arithmetic number, because the mean of its divisors is an integer number (3300570).

Almost surely, 2^139581900 is an apocalyptic number.

139581900 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 139581900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237641040).

139581900 is an abundant number, since it is smaller than the sum of its proper divisors (335700180).

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

139581900 is a wasteful number, since it uses less digits than its factorization.

139581900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081 (or 3068 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 139581900 is about 11814.4784057528. The cubic root of 139581900 is about 518.7319943429.

The spelling of 139581900 in words is "one hundred thirty-nine million, five hundred eighty-one thousand, nine hundred".