420866091 has 16 divisors (see below), whose sum is σ = 629682720. Its totient is φ = 277797600.

The previous prime is 420866071. The next prime is 420866123. The reversal of 420866091 is 190668024.

420866091 is a `hidden beast` number, since 42 + 0 + 8 + 6 + 609 + 1 = 666.

It is not a de Polignac number, because 420866091 - 2¹⁷ = 420735019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420866011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74440 + ... + 79893.

It is an arithmetic number, because the mean of its divisors is an integer number (39355170).

Almost surely, 2^420866091 is an apocalyptic number.

420866091 is a deficient number, since it is larger than the sum of its proper divisors (208816629).

420866091 is a wasteful number, since it uses less digits than its factorization.

420866091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154443 (or 154437 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 420866091 is about 20515.0211064966. The cubic root of 420866091 is about 749.4016507645.

The spelling of 420866091 in words is "four hundred twenty million, eight hundred sixty-six thousand, ninety-one".