421691670 has 40 divisors (see below), whose sum is σ = 1133884224. Its totient is φ = 112450896.

The previous prime is 421691659. The next prime is 421691687. The reversal of 421691670 is 76196124.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 259494 + ... + 261113.

Almost surely, 2^421691670 is an apocalyptic number.

421691670 is an abundant number, since it is smaller than the sum of its proper divisors (712192554).

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

421691670 is a wasteful number, since it uses less digits than its factorization.

421691670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520626 (or 520617 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 421691670 is about 20535.1325780965. The cubic root of 421691670 is about 749.8913442593.

The spelling of 421691670 in words is "four hundred twenty-one million, six hundred ninety-one thousand, six hundred seventy".