138402492 has 12 divisors (see below), whose sum is σ = 322939176. Its totient is φ = 46134160.

The previous prime is 138402461. The next prime is 138402493. The reversal of 138402492 is 294204831.

138402492 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138402493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5766759 + ... + 5766782.

It is an arithmetic number, because the mean of its divisors is an integer number (26911598).

Almost surely, 2^138402492 is an apocalyptic number.

138402492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138402492 is an abundant number, since it is smaller than the sum of its proper divisors (184536684).

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

138402492 is a wasteful number, since it uses less digits than its factorization.

138402492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11533548 (or 11533546 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 138402492 is about 11764.4588485829. The cubic root of 138402492 is about 517.2668379494.

The spelling of 138402492 in words is "one hundred thirty-eight million, four hundred two thousand, four hundred ninety-two".