421291872 has 36 divisors (see below), whose sum is σ = 1198049580. Its totient is φ = 140430528.

The previous prime is 421291861. The next prime is 421291877. The reversal of 421291872 is 278192124.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421291877) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 731122 + ... + 731697.

It is an arithmetic number, because the mean of its divisors is an integer number (33279155).

Almost surely, 2^421291872 is an apocalyptic number.

It is an amenable number.

421291872 is an abundant number, since it is smaller than the sum of its proper divisors (776757708).

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

421291872 is a wasteful number, since it uses less digits than its factorization.

421291872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1462835 (or 1462824 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 421291872 is about 20525.3957818114. The cubic root of 421291872 is about 749.6542833311.

The spelling of 421291872 in words is "four hundred twenty-one million, two hundred ninety-one thousand, eight hundred seventy-two".