405441664 has 16 divisors (see below), whose sum is σ = 807716070. Its totient is φ = 202720768.

The previous prime is 405441649. The next prime is 405441683. The reversal of 405441664 is 466144504.

It can be written as a sum of positive squares in only one way, i.e., 404814400 + 627264 = 20120^2 + 792^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1583629 + ... + 1583884.

Almost surely, 2^405441664 is an apocalyptic number.

It is an amenable number.

405441664 is a deficient number, since it is larger than the sum of its proper divisors (402274406).

405441664 is an equidigital number, since it uses as much as digits as its factorization.

405441664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167527 (or 3167515 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 405441664 is about 20135.5820377758. The cubic root of 405441664 is about 740.1324720229.

The spelling of 405441664 in words is "four hundred five million, four hundred forty-one thousand, six hundred sixty-four".