420891123 has 16 divisors (see below), whose sum is σ = 599270400. Its totient is φ = 262177440.

The previous prime is 420891109. The next prime is 420891131. The reversal of 420891123 is 321198024.

It is not a de Polignac number, because 420891123 - 2⁸ = 420890867 is a prime.

It is a super-2 number, since 2×420891123² = 354298674840402258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420891103) 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, 75333 + ... + 80726.

It is an arithmetic number, because the mean of its divisors is an integer number (37454400).

Almost surely, 2^420891123 is an apocalyptic number.

420891123 is a deficient number, since it is larger than the sum of its proper divisors (178379277).

420891123 is a wasteful number, since it uses less digits than its factorization.

420891123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156122.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 420891123 is about 20515.6311869755. The cubic root of 420891123 is about 749.4165079449.

The spelling of 420891123 in words is "four hundred twenty million, eight hundred ninety-one thousand, one hundred twenty-three".