397451621 has 8 divisors (see below), whose sum is σ = 455033280. Its totient is φ = 340070688.

The previous prime is 397451603. The next prime is 397451629. The reversal of 397451621 is 126154793.

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

It is a cyclic number.

It is not a de Polignac number, because 397451621 - 2¹⁴ = 397435237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397451629) 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, 45911 + ... + 53876.

It is an arithmetic number, because the mean of its divisors is an integer number (56879160).

Almost surely, 2^397451621 is an apocalyptic number.

It is an amenable number.

397451621 is a deficient number, since it is larger than the sum of its proper divisors (57581659).

397451621 is an equidigital number, since it uses as much as digits as its factorization.

397451621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100363.

The product of its digits is 45360, while the sum is 38.

The square root of 397451621 is about 19936.1887280393. The cubic root of 397451621 is about 735.2382469201.

The spelling of 397451621 in words is "three hundred ninety-seven million, four hundred fifty-one thousand, six hundred twenty-one".