420915816 has 48 divisors (see below), whose sum is σ = 1199983200. Its totient is φ = 132920352.

The previous prime is 420915809. The next prime is 420915829. The reversal of 420915816 is 618519024.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 152476 + ... + 155211.

It is an arithmetic number, because the mean of its divisors is an integer number (24999650).

Almost surely, 2^420915816 is an apocalyptic number.

It is an amenable number.

420915816 is an abundant number, since it is smaller than the sum of its proper divisors (779067384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420915816 is a wasteful number, since it uses less digits than its factorization.

420915816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307718 (or 307711 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 420915816 is about 20516.2329875638. The cubic root of 420915816 is about 749.4311633422.

The spelling of 420915816 in words is "four hundred twenty million, nine hundred fifteen thousand, eight hundred sixteen".