397828979 has 4 divisors (see below), whose sum is σ = 400463760. Its totient is φ = 395194200.

The previous prime is 397828969. The next prime is 397828997. The reversal of 397828979 is 979828793.

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 397828979 - 2¹² = 397824883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397828909) 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, 1317164 + ... + 1317465.

It is an arithmetic number, because the mean of its divisors is an integer number (100115940).

Almost surely, 2^397828979 is an apocalyptic number.

397828979 is a deficient number, since it is larger than the sum of its proper divisors (2634781).

397828979 is a wasteful number, since it uses less digits than its factorization.

397828979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634780.

The product of its digits is 13716864, while the sum is 62.

The square root of 397828979 is about 19945.6506286458. The cubic root of 397828979 is about 735.4708624628.

The spelling of 397828979 in words is "three hundred ninety-seven million, eight hundred twenty-eight thousand, nine hundred seventy-nine".