397544138 has 4 divisors (see below), whose sum is σ = 596316210. Its totient is φ = 198772068.

The previous prime is 397544131. The next prime is 397544141. The reversal of 397544138 is 831445793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831445793 = 283 ⋅2937971.

It can be written as a sum of positive squares in only one way, i.e., 285035689 + 112508449 = 16883^2 + 10607^2 .

It is not an unprimeable number, because it can be changed into a prime (397544131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99386033 + ... + 99386036.

Almost surely, 2^397544138 is an apocalyptic number.

397544138 is a deficient number, since it is larger than the sum of its proper divisors (198772072).

397544138 is a wasteful number, since it uses less digits than its factorization.

397544138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198772071.

The product of its digits is 362880, while the sum is 44.

The square root of 397544138 is about 19938.5089211806. The cubic root of 397544138 is about 735.2952909778.

The spelling of 397544138 in words is "three hundred ninety-seven million, five hundred forty-four thousand, one hundred thirty-eight".