420637986 has 12 divisors (see below), whose sum is σ = 911382342. Its totient is φ = 140212656.

The previous prime is 420637969. The next prime is 420637991. The reversal of 420637986 is 689736024.

420637986 is a `hidden beast` number, since 4 + 2 + 0 + 637 + 9 + 8 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 241211961 + 179426025 = 15531^2 + 13395^2 .

It is a super-2 number, since 2×420637986² = 353872630532272392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11684371 + ... + 11684406.

Almost surely, 2^420637986 is an apocalyptic number.

420637986 is an abundant number, since it is smaller than the sum of its proper divisors (490744356).

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

420637986 is a wasteful number, since it uses less digits than its factorization.

420637986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23368785 (or 23368782 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 420637986 is about 20509.4608900380. The cubic root of 420637986 is about 749.2662370233.

The spelling of 420637986 in words is "four hundred twenty million, six hundred thirty-seven thousand, nine hundred eighty-six".