397819975 has 48 divisors (see below), whose sum is σ = 609336000. Its totient is φ = 256650240.

The previous prime is 397819973. The next prime is 397819991. The reversal of 397819975 is 579918793.

It is a happy number.

It is not a de Polignac number, because 397819975 - 2¹ = 397819973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397819973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144411 + ... + 147139.

It is an arithmetic number, because the mean of its divisors is an integer number (12694500).

Almost surely, 2^397819975 is an apocalyptic number.

397819975 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

397819975 is a deficient number, since it is larger than the sum of its proper divisors (211516025).

397819975 is a wasteful number, since it uses less digits than its factorization.

397819975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777 (or 2758 counting only the distinct ones).

The product of its digits is 4286520, while the sum is 58.

The square root of 397819975 is about 19945.4249139997. The cubic root of 397819975 is about 735.4653138226.

The spelling of 397819975 in words is "three hundred ninety-seven million, eight hundred nineteen thousand, nine hundred seventy-five".