397643973 has 8 divisors (see below), whose sum is σ = 530284128. Its totient is φ = 265049904.

The previous prime is 397643947. The next prime is 397643999. The reversal of 397643973 is 379346793.

It is an interprime number because it is at equal distance from previous prime (397643947) and next prime (397643999).

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

It is not a de Polignac number, because 397643973 - 2⁸ = 397643717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397643903) 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, 27390 + ... + 39312.

It is an arithmetic number, because the mean of its divisors is an integer number (66285516).

Almost surely, 2^397643973 is an apocalyptic number.

It is an amenable number.

397643973 is a deficient number, since it is larger than the sum of its proper divisors (132640155).

397643973 is a wasteful number, since it uses less digits than its factorization.

397643973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23043.

The product of its digits is 2571912, while the sum is 51.

The square root of 397643973 is about 19941.0123363885. The cubic root of 397643973 is about 735.3568372349.

The spelling of 397643973 in words is "three hundred ninety-seven million, six hundred forty-three thousand, nine hundred seventy-three".