138232464 has 20 divisors (see below), whose sum is σ = 357100656. Its totient is φ = 46077472.

The previous prime is 138232463. The next prime is 138232483. The reversal of 138232464 is 464232831.

It is a super-2 number, since 2×138232464² = 38216428207022592, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (138232463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439874 + ... + 1439969.

Almost surely, 2^138232464 is an apocalyptic number.

It is an amenable number.

138232464 is an abundant number, since it is smaller than the sum of its proper divisors (218868192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138232464 is a wasteful number, since it uses less digits than its factorization.

138232464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879854 (or 2879848 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 138232464 is about 11757.2302860835. The cubic root of 138232464 is about 517.0549297078.

The spelling of 138232464 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, four hundred sixty-four".