139888931 has 8 divisors (see below), whose sum is σ = 172171104. Its totient is φ = 110681280.

The previous prime is 139888913. The next prime is 139888943.

139888931 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 139888931 - 2⁶ = 139888867 is a prime.

It is a super-2 number, since 2×139888931² = 39137826032645522, 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 139888931.

It is not an unprimeable number, because it can be changed into a prime (139888961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768530 + ... + 768711.

It is an arithmetic number, because the mean of its divisors is an integer number (21521388).

Almost surely, 2^139888931 is an apocalyptic number.

139888931 is a deficient number, since it is larger than the sum of its proper divisors (32282173).

139888931 is a wasteful number, since it uses less digits than its factorization.

139888931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537261.

The product of its digits is 373248, while the sum is 50.

The square root of 139888931 is about 11827.4651130325. The cubic root of 139888931 is about 519.1120583495.

The spelling of 139888931 in words is "one hundred thirty-nine million, eight hundred eighty-eight thousand, nine hundred thirty-one".