421268639 has 6 divisors (see below), whose sum is σ = 463047480. Its totient is φ = 382971380.

The previous prime is 421268609. The next prime is 421268663. The reversal of 421268639 is 936862124.

It is a de Polignac number, because none of the positive numbers 2^k-421268639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421268596 and 421268605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421268609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1740659 + ... + 1740900.

It is an arithmetic number, because the mean of its divisors is an integer number (77174580).

Almost surely, 2^421268639 is an apocalyptic number.

421268639 is a deficient number, since it is larger than the sum of its proper divisors (41778841).

421268639 is a wasteful number, since it uses less digits than its factorization.

421268639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481581 (or 3481570 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 421268639 is about 20524.8298165904. The cubic root of 421268639 is about 749.6405026727.

The spelling of 421268639 in words is "four hundred twenty-one million, two hundred sixty-eight thousand, six hundred thirty-nine".