421320906 has 16 divisors (see below), whose sum is σ = 936268800. Its totient is φ = 140440284.

The previous prime is 421320901. The next prime is 421320919. The reversal of 421320906 is 609023124.

It is a super-2 number, since 2×421320906² = 355022611665321672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 421320906.

It is not an unprimeable number, because it can be changed into a prime (421320901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3901066 + ... + 3901173.

It is an arithmetic number, because the mean of its divisors is an integer number (58516800).

Almost surely, 2^421320906 is an apocalyptic number.

421320906 is an abundant number, since it is smaller than the sum of its proper divisors (514947894).

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

421320906 is a wasteful number, since it uses less digits than its factorization.

421320906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7802250 (or 7802244 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 421320906 is about 20526.1030397881. The cubic root of 421320906 is about 749.6715041416.

The spelling of 421320906 in words is "four hundred twenty-one million, three hundred twenty thousand, nine hundred six".