138492377 has 2 divisors, whose sum is σ = 138492378. Its totient is φ = 138492376.

The previous prime is 138492373. The next prime is 138492391. The reversal of 138492377 is 773294831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135047641 + 3444736 = 11621^2 + 1856^2 .

It is a cyclic number.

It is not a de Polignac number, because 138492377 - 2² = 138492373 is a prime.

It is a super-2 number, since 2×138492377² = 38360276974220258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138492373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69246188 + 69246189.

It is an arithmetic number, because the mean of its divisors is an integer number (69246189).

Almost surely, 2^138492377 is an apocalyptic number.

It is an amenable number.

138492377 is a deficient number, since it is larger than the sum of its proper divisors (1).

138492377 is an equidigital number, since it uses as much as digits as its factorization.

138492377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 44.

The square root of 138492377 is about 11768.2784212475. The cubic root of 138492377 is about 517.3787927450.

The spelling of 138492377 in words is "one hundred thirty-eight million, four hundred ninety-two thousand, three hundred seventy-seven".