139747931 has 8 divisors (see below), whose sum is σ = 148296960. Its totient is φ = 131405032.

The previous prime is 139747913. The next prime is 139747957.

139747931 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139747931 - 2¹⁰ = 139746907 is a prime.

It is a super-2 number, since 2×139747931² = 39058968437561522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139747901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50135 + ... + 52848.

It is an arithmetic number, because the mean of its divisors is an integer number (18537120).

Almost surely, 2^139747931 is an apocalyptic number.

139747931 is a deficient number, since it is larger than the sum of its proper divisors (8549029).

139747931 is a wasteful number, since it uses less digits than its factorization.

139747931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103065.

The product of its digits is 142884, while the sum is 44.

The square root of 139747931 is about 11821.5029078371. The cubic root of 139747931 is about 518.9375880143.

The spelling of 139747931 in words is "one hundred thirty-nine million, seven hundred forty-seven thousand, nine hundred thirty-one".