139522860 has 144 divisors (see below), whose sum is σ = 437909472. Its totient is φ = 35942400.

The previous prime is 139522843. The next prime is 139522861. The reversal of 139522860 is 68225931.

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 (139522861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1064995 + ... + 1065125.

It is an arithmetic number, because the mean of its divisors is an integer number (3041038).

Almost surely, 2^139522860 is an apocalyptic number.

139522860 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 139522860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218954736).

139522860 is an abundant number, since it is smaller than the sum of its proper divisors (298386612).

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

139522860 is a wasteful number, since it uses less digits than its factorization.

139522860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 139522860 is about 11811.9795123425. The cubic root of 139522860 is about 518.6588467118.

The spelling of 139522860 in words is "one hundred thirty-nine million, five hundred twenty-two thousand, eight hundred sixty".