397838390 has 32 divisors (see below), whose sum is σ = 722826720. Its totient is φ = 157651200.

The previous prime is 397838387. The next prime is 397838411. The reversal of 397838390 is 93838793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 862760 + ... + 863220.

It is an arithmetic number, because the mean of its divisors is an integer number (22588335).

Almost surely, 2^397838390 is an apocalyptic number.

397838390 is a deficient number, since it is larger than the sum of its proper divisors (324988330).

397838390 is a wasteful number, since it uses less digits than its factorization.

397838390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 397838390 is about 19945.8865433452. The cubic root of 397838390 is about 735.4766618239.

The spelling of 397838390 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, three hundred ninety".