421866979 has 4 divisors (see below), whose sum is σ = 422203320. Its totient is φ = 421530640.

The previous prime is 421866947. The next prime is 421866997. The reversal of 421866979 is 979668124.

It is a happy number.

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 421866979 - 2⁵ = 421866947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421866919) 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, 166282 + ... + 168799.

It is an arithmetic number, because the mean of its divisors is an integer number (105550830).

Almost surely, 2^421866979 is an apocalyptic number.

421866979 is a deficient number, since it is larger than the sum of its proper divisors (336341).

421866979 is a wasteful number, since it uses less digits than its factorization.

421866979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336340.

The product of its digits is 1306368, while the sum is 52.

The square root of 421866979 is about 20539.4006485097. The cubic root of 421866979 is about 749.9952467847.

The spelling of 421866979 in words is "four hundred twenty-one million, eight hundred sixty-six thousand, nine hundred seventy-nine".