138356492 has 12 divisors (see below), whose sum is σ = 245189280. Its totient is φ = 68302416.

The previous prime is 138356473. The next prime is 138356521. The reversal of 138356492 is 294653831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218603 + ... + 219234.

It is an arithmetic number, because the mean of its divisors is an integer number (20432440).

Almost surely, 2^138356492 is an apocalyptic number.

It is an amenable number.

138356492 is a deficient number, since it is larger than the sum of its proper divisors (106832788).

138356492 is a wasteful number, since it uses less digits than its factorization.

138356492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437920 (or 437918 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 138356492 is about 11762.5036450579. The cubic root of 138356492 is about 517.2095246481.

It can be divided in two parts, 1383 and 56492, that added together give a palindrome (57875).

The spelling of 138356492 in words is "one hundred thirty-eight million, three hundred fifty-six thousand, four hundred ninety-two".