138396507 has 8 divisors (see below), whose sum is σ = 195383376. Its totient is φ = 86836992.

The previous prime is 138396487. The next prime is 138396527. The reversal of 138396507 is 705693831.

It is an interprime number because it is at equal distance from previous prime (138396487) and next prime (138396527).

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

It is not a de Polignac number, because 138396507 - 2¹⁰ = 138395483 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (138396527) 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, 1356778 + ... + 1356879.

It is an arithmetic number, because the mean of its divisors is an integer number (24422922).

Almost surely, 2^138396507 is an apocalyptic number.

138396507 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

138396507 is a deficient number, since it is larger than the sum of its proper divisors (56986869).

138396507 is a wasteful number, since it uses less digits than its factorization.

138396507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713677.

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 138396507 is about 11764.2044779917. The cubic root of 138396507 is about 517.2593817092.

The spelling of 138396507 in words is "one hundred thirty-eight million, three hundred ninety-six thousand, five hundred seven".