428415979 has 4 divisors (see below), whose sum is σ = 429629976. Its totient is φ = 427201984.

The previous prime is 428415947. The next prime is 428415991. The reversal of 428415979 is 979514824.

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 428415979 - 2⁵ = 428415947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428415919) 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, 606469 + ... + 607174.

It is an arithmetic number, because the mean of its divisors is an integer number (107407494).

Almost surely, 2^428415979 is an apocalyptic number.

428415979 is a deficient number, since it is larger than the sum of its proper divisors (1213997).

428415979 is a wasteful number, since it uses less digits than its factorization.

428415979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213996.

The product of its digits is 725760, while the sum is 49.

The square root of 428415979 is about 20698.2119759171. The cubic root of 428415979 is about 753.8562739228.

The spelling of 428415979 in words is "four hundred twenty-eight million, four hundred fifteen thousand, nine hundred seventy-nine".