420456879 has 16 divisors (see below), whose sum is σ = 629324640. Its totient is φ = 277413120.

The previous prime is 420456857. The next prime is 420456893. The reversal of 420456879 is 978654024.

It is a happy number.

It is not a de Polignac number, because 420456879 - 2¹¹ = 420454831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420456979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77652 + ... + 82889.

It is an arithmetic number, because the mean of its divisors is an integer number (39332790).

Almost surely, 2^420456879 is an apocalyptic number.

420456879 is a deficient number, since it is larger than the sum of its proper divisors (208867761).

420456879 is a wasteful number, since it uses less digits than its factorization.

420456879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160647 (or 160641 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 420456879 is about 20505.0452084359. The cubic root of 420456879 is about 749.1586886131.

The spelling of 420456879 in words is "four hundred twenty million, four hundred fifty-six thousand, eight hundred seventy-nine".