397772138 has 16 divisors (see below), whose sum is σ = 603970560. Its totient is φ = 196458000.

The previous prime is 397772131. The next prime is 397772147. The reversal of 397772138 is 831277793.

It is a junction number, because it is equal to n+sod(n) for n = 397772092 and 397772101.

It is not an unprimeable number, because it can be changed into a prime (397772131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94703 + ... + 98813.

It is an arithmetic number, because the mean of its divisors is an integer number (37748160).

Almost surely, 2^397772138 is an apocalyptic number.

397772138 is a deficient number, since it is larger than the sum of its proper divisors (206198422).

397772138 is a wasteful number, since it uses less digits than its factorization.

397772138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4693.

The product of its digits is 444528, while the sum is 47.

The square root of 397772138 is about 19944.2256806325. The cubic root of 397772138 is about 735.4358332646.

The spelling of 397772138 in words is "three hundred ninety-seven million, seven hundred seventy-two thousand, one hundred thirty-eight".