426431640 has 64 divisors (see below), whose sum is σ = 1303452000. Its totient is φ = 111567872.

The previous prime is 426431597. The next prime is 426431641. The reversal of 426431640 is 46134624.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 426431598 and 426431607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426431641) 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, 27165 + ... + 39884.

Almost surely, 2^426431640 is an apocalyptic number.

426431640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

426431640 is an abundant number, since it is smaller than the sum of its proper divisors (877020360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

426431640 is a wasteful number, since it uses less digits than its factorization.

426431640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67116 (or 67112 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 426431640 is about 20650.2213063202. The cubic root of 426431640 is about 752.6905673653.

The spelling of 426431640 in words is "four hundred twenty-six million, four hundred thirty-one thousand, six hundred forty".