138415812 has 24 divisors (see below), whose sum is σ = 323752800. Its totient is φ = 46026816.

The previous prime is 138415801. The next prime is 138415813. The reversal of 138415812 is 218514831.

It is not an unprimeable number, because it can be changed into a prime (138415813) 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, 8737 + ... + 18792.

It is an arithmetic number, because the mean of its divisors is an integer number (13489700).

Almost surely, 2^138415812 is an apocalyptic number.

138415812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138415812 is an abundant number, since it is smaller than the sum of its proper divisors (185336988).

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

138415812 is a wasteful number, since it uses less digits than its factorization.

138415812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27955 (or 27953 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 138415812 is about 11765.0249468499. The cubic root of 138415812 is about 517.2834315168.

The spelling of 138415812 in words is "one hundred thirty-eight million, four hundred fifteen thousand, eight hundred twelve".