397835638 has 4 divisors (see below), whose sum is σ = 596753460. Its totient is φ = 198917818.

The previous prime is 397835621. The next prime is 397835639. The reversal of 397835638 is 836538793.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397835639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99458908 + ... + 99458911.

It is an arithmetic number, because the mean of its divisors is an integer number (149188365).

Almost surely, 2^397835638 is an apocalyptic number.

397835638 is a deficient number, since it is larger than the sum of its proper divisors (198917822).

397835638 is a wasteful number, since it uses less digits than its factorization.

397835638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198917821.

The product of its digits is 3265920, while the sum is 52.

The square root of 397835638 is about 19945.8175565706. The cubic root of 397835638 is about 735.4749659623.

The spelling of 397835638 in words is "three hundred ninety-seven million, eight hundred thirty-five thousand, six hundred thirty-eight".