139573731 has 16 divisors (see below), whose sum is σ = 208505088. Its totient is φ = 82303200.

The previous prime is 139573711. The next prime is 139573739. The reversal of 139573731 is 137375931.

139573731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139573731 - 2⁵ = 139573699 is a prime.

It is a super-2 number, since 2×139573731² = 38961652770520722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139573731.

It is not an unprimeable number, because it can be changed into a prime (139573739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55935 + ... + 58376.

It is an arithmetic number, because the mean of its divisors is an integer number (13031568).

Almost surely, 2^139573731 is an apocalyptic number.

139573731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

139573731 is a deficient number, since it is larger than the sum of its proper divisors (68931357).

139573731 is a wasteful number, since it uses less digits than its factorization.

139573731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114362.

The product of its digits is 59535, while the sum is 39.

The square root of 139573731 is about 11814.1326808192. The cubic root of 139573731 is about 518.7218745868.

The spelling of 139573731 in words is "one hundred thirty-nine million, five hundred seventy-three thousand, seven hundred thirty-one".