421639169 has 12 divisors (see below), whose sum is σ = 490904064. Its totient is φ = 361091304.

The previous prime is 421639147. The next prime is 421639181. The reversal of 421639169 is 961936124.

It is a de Polignac number, because none of the positive numbers 2^k-421639169 is a prime.

It is a super-2 number, since 2×421639169² = 355559177670021122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421639139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66704 + ... + 72750.

It is an arithmetic number, because the mean of its divisors is an integer number (40908672).

Almost surely, 2^421639169 is an apocalyptic number.

421639169 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

421639169 is a deficient number, since it is larger than the sum of its proper divisors (69264895).

421639169 is a wasteful number, since it uses less digits than its factorization.

421639169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7484 (or 7477 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 421639169 is about 20533.8542168780. The cubic root of 421639169 is about 749.8602222475.

The spelling of 421639169 in words is "four hundred twenty-one million, six hundred thirty-nine thousand, one hundred sixty-nine".