406221312 has 80 divisors (see below), whose sum is σ = 1236831552. Its totient is φ = 116060160.

The previous prime is 406221281. The next prime is 406221323. The reversal of 406221312 is 213122604.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8139 + ... + 29642.

Almost surely, 2^406221312 is an apocalyptic number.

406221312 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

406221312 is an abundant number, since it is smaller than the sum of its proper divisors (830610240).

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

406221312 is an equidigital number, since it uses as much as digits as its factorization.

406221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37809 (or 37793 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 406221312 is about 20154.9326964890. The cubic root of 406221312 is about 740.6065832377.

Adding to 406221312 its reverse (213122604), we get a palindrome (619343916).

The spelling of 406221312 in words is "four hundred six million, two hundred twenty-one thousand, three hundred twelve".