397800638 has 8 divisors (see below), whose sum is σ = 597035880. Its totient is φ = 198788680.

The previous prime is 397800631. The next prime is 397800643. The reversal of 397800638 is 836008793.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 51293 + ... + 58536.

It is an arithmetic number, because the mean of its divisors is an integer number (74629485).

Almost surely, 2^397800638 is an apocalyptic number.

397800638 is a deficient number, since it is larger than the sum of its proper divisors (199235242).

397800638 is a wasteful number, since it uses less digits than its factorization.

397800638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111642.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 397800638 is about 19944.9401603514. The cubic root of 397800638 is about 735.4533972739.

The spelling of 397800638 in words is "three hundred ninety-seven million, eight hundred thousand, six hundred thirty-eight".