421791645 has 32 divisors (see below), whose sum is σ = 738537984. Its totient is φ = 203860800.

The previous prime is 421791619. The next prime is 421791653. The reversal of 421791645 is 546197124.

It is a de Polignac number, because none of the positive numbers 2^k-421791645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50754 + ... + 58476.

It is an arithmetic number, because the mean of its divisors is an integer number (23079312).

Almost surely, 2^421791645 is an apocalyptic number.

It is an amenable number.

421791645 is a deficient number, since it is larger than the sum of its proper divisors (316746339).

421791645 is a wasteful number, since it uses less digits than its factorization.

421791645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8073.

The product of its digits is 60480, while the sum is 39.

The square root of 421791645 is about 20537.5666767025. The cubic root of 421791645 is about 749.9506011909.

The spelling of 421791645 in words is "four hundred twenty-one million, seven hundred ninety-one thousand, six hundred forty-five".