139993524 has 72 divisors (see below), whose sum is σ = 387380448. Its totient is φ = 42275520.

The previous prime is 139993499. The next prime is 139993537. The reversal of 139993524 is 425399931.

139993524 is a `hidden beast` number, since 1 + 39 + 9 + 93 + 524 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 139993524.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184554 + ... + 185310.

It is an arithmetic number, because the mean of its divisors is an integer number (5380284).

Almost surely, 2^139993524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139993524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193690224).

139993524 is an abundant number, since it is smaller than the sum of its proper divisors (247386924).

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

139993524 is a wasteful number, since it uses less digits than its factorization.

139993524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1240 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 139993524 is about 11831.8859020868. The cubic root of 139993524 is about 519.2414037303.

The spelling of 139993524 in words is "one hundred thirty-nine million, nine hundred ninety-three thousand, five hundred twenty-four".