139531572 has 36 divisors (see below), whose sum is σ = 365770496. Its totient is φ = 46510200.

The previous prime is 139531571. The next prime is 139531591. The reversal of 139531572 is 275135931.

139531572 is a `hidden beast` number, since 1 + 39 + 53 + 1 + 572 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139531571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70804 + ... + 72747.

Almost surely, 2^139531572 is an apocalyptic number.

139531572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139531572 is an abundant number, since it is smaller than the sum of its proper divisors (226238924).

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

139531572 is a wasteful number, since it uses less digits than its factorization.

139531572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143570 (or 143556 counting only the distinct ones).

The product of its digits is 28350, while the sum is 36.

The square root of 139531572 is about 11812.3482847400. The cubic root of 139531572 is about 518.6696417452.

The spelling of 139531572 in words is "one hundred thirty-nine million, five hundred thirty-one thousand, five hundred seventy-two".