138163257 has 24 divisors (see below), whose sum is σ = 205233600. Its totient is φ = 89516448.

The previous prime is 138163243. The next prime is 138163321. The reversal of 138163257 is 752361831.

138163257 is a `hidden beast` number, since 13 + 8 + 1 + 632 + 5 + 7 = 666.

It is not a de Polignac number, because 138163257 - 2¹⁴ = 138146873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138163357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87844 + ... + 89402.

It is an arithmetic number, because the mean of its divisors is an integer number (8551400).

Almost surely, 2^138163257 is an apocalyptic number.

It is an amenable number.

138163257 is a deficient number, since it is larger than the sum of its proper divisors (67070343).

138163257 is a wasteful number, since it uses less digits than its factorization.

138163257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1834 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 138163257 is about 11754.2867499479. The cubic root of 138163257 is about 516.9686263101.

The spelling of 138163257 in words is "one hundred thirty-eight million, one hundred sixty-three thousand, two hundred fifty-seven".