420645979 has 8 divisors (see below), whose sum is σ = 454886432. Its totient is φ = 386674560.

The previous prime is 420645947. The next prime is 420645983. The reversal of 420645979 is 979546024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420645979 - 2⁵ = 420645947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420645989) 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 7 ways as a sum of consecutive naturals, for example, 63999 + ... + 70264.

It is an arithmetic number, because the mean of its divisors is an integer number (56860804).

Almost surely, 2^420645979 is an apocalyptic number.

420645979 is a deficient number, since it is larger than the sum of its proper divisors (34240453).

420645979 is a wasteful number, since it uses less digits than its factorization.

420645979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134517.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 420645979 is about 20509.6557504021. The cubic root of 420645979 is about 749.2709828676.

The spelling of 420645979 in words is "four hundred twenty million, six hundred forty-five thousand, nine hundred seventy-nine".