409220646 has 48 divisors (see below), whose sum is σ = 883384320. Its totient is φ = 126236880.

The previous prime is 409220633. The next prime is 409220731. The reversal of 409220646 is 646022904.

It is a happy number.

It is a super-2 number, since 2×409220646² = 334923074225314632, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96315 + ... + 100473.

It is an arithmetic number, because the mean of its divisors is an integer number (18403840).

Almost surely, 2^409220646 is an apocalyptic number.

409220646 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

409220646 is an abundant number, since it is smaller than the sum of its proper divisors (474163674).

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

409220646 is a wasteful number, since it uses less digits than its factorization.

409220646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241 (or 4218 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 409220646 is about 20229.2028018901. The cubic root of 409220646 is about 742.4248710389.

The spelling of 409220646 in words is "four hundred nine million, two hundred twenty thousand, six hundred forty-six".