397800639 has 10 divisors (see below), whose sum is σ = 594245520. Its totient is φ = 265200372.

The previous prime is 397800631. The next prime is 397800643. The reversal of 397800639 is 936008793.

It is a happy number.

397800639 is a `hidden beast` number, since 3 + 9 + 7 + 8 + 0 + 0 + 639 = 666.

It is not a de Polignac number, because 397800639 - 2³ = 397800631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397800594 and 397800603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397800631) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2455479 + ... + 2455640.

It is an arithmetic number, because the mean of its divisors is an integer number (59424552).

Almost surely, 2^397800639 is an apocalyptic number.

397800639 is a deficient number, since it is larger than the sum of its proper divisors (196444881).

397800639 is an equidigital number, since it uses as much as digits as its factorization.

397800639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911131 (or 4911122 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 397800639 is about 19944.9401854205. The cubic root of 397800639 is about 735.4533978902.

The spelling of 397800639 in words is "three hundred ninety-seven million, eight hundred thousand, six hundred thirty-nine".