139817975 has 36 divisors (see below), whose sum is σ = 193836552. Its totient is φ = 99216000.

The previous prime is 139817971. The next prime is 139817987. The reversal of 139817975 is 579718931.

It is not a de Polignac number, because 139817975 - 2² = 139817971 is a prime.

It is a super-2 number, since 2×139817975² = 39098132266201250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139817971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 772385 + ... + 772565.

Almost surely, 2^139817975 is an apocalyptic number.

139817975 is a deficient number, since it is larger than the sum of its proper divisors (54018577).

139817975 is a wasteful number, since it uses less digits than its factorization.

139817975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 250 counting only the distinct ones).

The product of its digits is 476280, while the sum is 50.

The square root of 139817975 is about 11824.4651041812. The cubic root of 139817975 is about 519.0242735989.

The spelling of 139817975 in words is "one hundred thirty-nine million, eight hundred seventeen thousand, nine hundred seventy-five".