420724018 has 24 divisors (see below), whose sum is σ = 747038124. Its totient is φ = 176526240.

The previous prime is 420723937. The next prime is 420724079. The reversal of 420724018 is 810427024.

It can be written as a sum of positive squares in 2 ways, for example, as 403889409 + 16834609 = 20097^2 + 4103^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63721 + ... + 70012.

Almost surely, 2^420724018 is an apocalyptic number.

420724018 is a deficient number, since it is larger than the sum of its proper divisors (326314106).

420724018 is a wasteful number, since it uses less digits than its factorization.

420724018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133770 (or 133759 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 420724018 is about 20511.5581563176. The cubic root of 420724018 is about 749.3173153701.

The spelling of 420724018 in words is "four hundred twenty million, seven hundred twenty-four thousand, eighteen".