138154812 has 12 divisors (see below), whose sum is σ = 322361256. Its totient is φ = 46051600.

The previous prime is 138154777. The next prime is 138154823. The reversal of 138154812 is 218451831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5756439 + ... + 5756462.

It is an arithmetic number, because the mean of its divisors is an integer number (26863438).

Almost surely, 2^138154812 is an apocalyptic number.

138154812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138154812 is an abundant number, since it is smaller than the sum of its proper divisors (184206444).

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

138154812 is a wasteful number, since it uses less digits than its factorization.

138154812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11512908 (or 11512906 counting only the distinct ones).

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

The square root of 138154812 is about 11753.9275138143. The cubic root of 138154812 is about 516.9580931454.

The spelling of 138154812 in words is "one hundred thirty-eight million, one hundred fifty-four thousand, eight hundred twelve".