404638945 has 8 divisors (see below), whose sum is σ = 491023080. Its totient is φ = 320073600.

The previous prime is 404638921. The next prime is 404638951. The reversal of 404638945 is 549836404.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 84658401 + 319980544 = 9201^2 + 17888^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404638945 - 2¹⁵ = 404606177 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 454206 + ... + 455095.

It is an arithmetic number, because the mean of its divisors is an integer number (61377885).

Almost surely, 2^404638945 is an apocalyptic number.

It is an amenable number.

404638945 is a deficient number, since it is larger than the sum of its proper divisors (86384135).

404638945 is an equidigital number, since it uses as much as digits as its factorization.

404638945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909395.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 404638945 is about 20115.6393137280. The cubic root of 404638945 is about 739.6436956477.

The spelling of 404638945 in words is "four hundred four million, six hundred thirty-eight thousand, nine hundred forty-five".