138465831 has 8 divisors (see below), whose sum is σ = 210995584. Its totient is φ = 79123320.

The previous prime is 138465781. The next prime is 138465857. The reversal of 138465831 is 138564831.

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

It is not a de Polignac number, because 138465831 - 2⁹ = 138465319 is a prime.

It is a super-2 number, since 2×138465831² = 38345572709041122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138465831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138465881) 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, 3296785 + ... + 3296826.

It is an arithmetic number, because the mean of its divisors is an integer number (26374448).

Almost surely, 2^138465831 is an apocalyptic number.

138465831 is a deficient number, since it is larger than the sum of its proper divisors (72529753).

138465831 is an equidigital number, since it uses as much as digits as its factorization.

138465831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593621.

The product of its digits is 69120, while the sum is 39.

The square root of 138465831 is about 11767.1505046889. The cubic root of 138465831 is about 517.3457338495.

The spelling of 138465831 in words is "one hundred thirty-eight million, four hundred sixty-five thousand, eight hundred thirty-one".