397912499 has 4 divisors (see below), whose sum is σ = 405420336. Its totient is φ = 390404664.

The previous prime is 397912483. The next prime is 397912513. The reversal of 397912499 is 994219793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994219793 = 7 ⋅142031399.

It is a cyclic number.

It is not a de Polignac number, because 397912499 - 2⁴ = 397912483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 7507783 = 397912499 / (3 + 9 + 7 + 9 + 1 + 2 + 4 + 9 + 9).

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 397912499.

It is not an unprimeable number, because it can be changed into a prime (397912409) 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 3 ways as a sum of consecutive naturals, for example, 3753839 + ... + 3753944.

It is an arithmetic number, because the mean of its divisors is an integer number (101355084).

Almost surely, 2^397912499 is an apocalyptic number.

397912499 is a deficient number, since it is larger than the sum of its proper divisors (7507837).

397912499 is an equidigital number, since it uses as much as digits as its factorization.

397912499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507836.

The product of its digits is 1102248, while the sum is 53.

The square root of 397912499 is about 19947.7442083059. The cubic root of 397912499 is about 735.5223269794.

The spelling of 397912499 in words is "three hundred ninety-seven million, nine hundred twelve thousand, four hundred ninety-nine".