421642979 has 4 divisors (see below), whose sum is σ = 421727376. Its totient is φ = 421558584.

The previous prime is 421642973. The next prime is 421642999. The reversal of 421642979 is 979246124.

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 421642979 - 2⁸ = 421642723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421642973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34199 + ... + 44864.

It is an arithmetic number, because the mean of its divisors is an integer number (105431844).

Almost surely, 2^421642979 is an apocalyptic number.

421642979 is a deficient number, since it is larger than the sum of its proper divisors (84397).

421642979 is an equidigital number, since it uses as much as digits as its factorization.

421642979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84396.

The product of its digits is 217728, while the sum is 44.

The square root of 421642979 is about 20533.9469902890. The cubic root of 421642979 is about 749.8624808603.

The spelling of 421642979 in words is "four hundred twenty-one million, six hundred forty-two thousand, nine hundred seventy-nine".