138293788 has 6 divisors (see below), whose sum is σ = 242014136. Its totient is φ = 69146892.

The previous prime is 138293783. The next prime is 138293791. The reversal of 138293788 is 887392831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138293783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17286720 + ... + 17286727.

Almost surely, 2^138293788 is an apocalyptic number.

It is an amenable number.

138293788 is a deficient number, since it is larger than the sum of its proper divisors (103720348).

138293788 is a wasteful number, since it uses less digits than its factorization.

138293788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34573451 (or 34573449 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 138293788 is about 11759.8379240532. The cubic root of 138293788 is about 517.1313786787.

The spelling of 138293788 in words is "one hundred thirty-eight million, two hundred ninety-three thousand, seven hundred eighty-eight".