421691672 has 8 divisors (see below), whose sum is σ = 790671900. Its totient is φ = 210845832.

The previous prime is 421691659. The next prime is 421691687. The reversal of 421691672 is 276196124.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26355722 + ... + 26355737.

Almost surely, 2^421691672 is an apocalyptic number.

It is an amenable number.

421691672 is a deficient number, since it is larger than the sum of its proper divisors (368980228).

421691672 is a wasteful number, since it uses less digits than its factorization.

421691672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52711465 (or 52711461 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 421691672 is about 20535.1326267935. The cubic root of 421691672 is about 749.8913454449.

The spelling of 421691672 in words is "four hundred twenty-one million, six hundred ninety-one thousand, six hundred seventy-two".