138354957 has 12 divisors (see below), whose sum is σ = 215219004. Its totient is φ = 85141440.

The previous prime is 138354919. The next prime is 138354961. The reversal of 138354957 is 759453831.

It can be written as a sum of positive squares in 2 ways, for example, as 75533481 + 62821476 = 8691^2 + 7926^2 .

It is not a de Polignac number, because 138354957 - 2¹¹ = 138352909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138354907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 591144 + ... + 591377.

It is an arithmetic number, because the mean of its divisors is an integer number (17934917).

Almost surely, 2^138354957 is an apocalyptic number.

It is an amenable number.

138354957 is a deficient number, since it is larger than the sum of its proper divisors (76864047).

138354957 is a wasteful number, since it uses less digits than its factorization.

138354957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182540 (or 1182537 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 138354957 is about 11762.4383951628. The cubic root of 138354957 is about 517.2076119092.

The spelling of 138354957 in words is "one hundred thirty-eight million, three hundred fifty-four thousand, nine hundred fifty-seven".