397500019 has 4 divisors (see below), whose sum is σ = 454285744. Its totient is φ = 340714296.

The previous prime is 397500017. The next prime is 397500029. The reversal of 397500019 is 910005793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397500019 - 2¹ = 397500017 is a prime.

It is a super-2 number, since 2×397500019² = 316012530210000722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397500017) 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, 28392852 + ... + 28392865.

It is an arithmetic number, because the mean of its divisors is an integer number (113571436).

Almost surely, 2^397500019 is an apocalyptic number.

397500019 is a deficient number, since it is larger than the sum of its proper divisors (56785725).

397500019 is an equidigital number, since it uses as much as digits as its factorization.

397500019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56785724.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 397500019 is about 19937.4025138682. The cubic root of 397500019 is about 735.2680892241.

The spelling of 397500019 in words is "three hundred ninety-seven million, five hundred thousand, nineteen".