138744392 has 16 divisors (see below), whose sum is σ = 261456000. Its totient is φ = 69022800.

The previous prime is 138744373. The next prime is 138744409. The reversal of 138744392 is 293447831.

It is a super-2 number, since 2×138744392² = 38500012622899328, which contains 22 as substring.

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, 41984 + ... + 45167.

It is an arithmetic number, because the mean of its divisors is an integer number (16341000).

Almost surely, 2^138744392 is an apocalyptic number.

It is an amenable number.

138744392 is a deficient number, since it is larger than the sum of its proper divisors (122711608).

138744392 is a wasteful number, since it uses less digits than its factorization.

138744392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87356 (or 87352 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 138744392 is about 11778.9809406417. The cubic root of 138744392 is about 517.6924278356.

The spelling of 138744392 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, three hundred ninety-two".