138974817 has 24 divisors (see below), whose sum is σ = 192765856. Its totient is φ = 89039808.

The previous prime is 138974807. The next prime is 138974827. The reversal of 138974817 is 718479831.

It is an interprime number because it is at equal distance from previous prime (138974807) and next prime (138974827).

It is not a de Polignac number, because 138974817 - 2¹² = 138970721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138974807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 443853 + ... + 444165.

Almost surely, 2^138974817 is an apocalyptic number.

It is an amenable number.

138974817 is a deficient number, since it is larger than the sum of its proper divisors (53791039).

138974817 is an equidigital number, since it uses as much as digits as its factorization.

138974817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 430 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 138974817 is about 11788.7580770834. The cubic root of 138974817 is about 517.9788617562.

The spelling of 138974817 in words is "one hundred thirty-eight million, nine hundred seventy-four thousand, eight hundred seventeen".