420630891 has 32 divisors (see below), whose sum is σ = 584517120. Its totient is φ = 268925184.

The previous prime is 420630887. The next prime is 420630943. The reversal of 420630891 is 198036024.

It is not a de Polignac number, because 420630891 - 2² = 420630887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420630841) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1599226 + ... + 1599488.

It is an arithmetic number, because the mean of its divisors is an integer number (18266160).

Almost surely, 2^420630891 is an apocalyptic number.

420630891 is a deficient number, since it is larger than the sum of its proper divisors (163886229).

420630891 is a wasteful number, since it uses less digits than its factorization.

420630891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 420630891 is about 20509.2879203545. The cubic root of 420630891 is about 749.2620243162.

The spelling of 420630891 in words is "four hundred twenty million, six hundred thirty thousand, eight hundred ninety-one".