397904251 has 8 divisors (see below), whose sum is σ = 432358400. Its totient is φ = 364801320.

The previous prime is 397904237. The next prime is 397904257. The reversal of 397904251 is 152409793.

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 397904251 - 2¹⁷ = 397773179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397904257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337191 + ... + 338368.

It is an arithmetic number, because the mean of its divisors is an integer number (54044800).

Almost surely, 2^397904251 is an apocalyptic number.

397904251 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

397904251 is a deficient number, since it is larger than the sum of its proper divisors (34454149).

397904251 is a wasteful number, since it uses less digits than its factorization.

397904251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675609.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 397904251 is about 19947.5374670660. The cubic root of 397904251 is about 735.5172449324.

The spelling of 397904251 in words is "three hundred ninety-seven million, nine hundred four thousand, two hundred fifty-one".