139421520 has 160 divisors (see below), whose sum is σ = 548893440. Its totient is φ = 31864320.

The previous prime is 139421519. The next prime is 139421549. The reversal of 139421520 is 25124931.

139421520 is a `hidden beast` number, since 139 + 4 + 2 + 1 + 520 = 666.

It is a super-2 number, since 2×139421520² = 38876720478220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 10510 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (3430584).

Almost surely, 2^139421520 is an apocalyptic number.

139421520 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 139421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274446720).

139421520 is an abundant number, since it is smaller than the sum of its proper divisors (409471920).

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

139421520 is a wasteful number, since it uses less digits than its factorization.

139421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250 (or 9238 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 139421520 is about 11807.6890202952. The cubic root of 139421520 is about 518.5332433561.

The spelling of 139421520 in words is "one hundred thirty-nine million, four hundred twenty-one thousand, five hundred twenty".