404445623 has 16 divisors (see below), whose sum is σ = 448148736. Its totient is φ = 363294720.

The previous prime is 404445619. The next prime is 404445641. The reversal of 404445623 is 326544404.

It is not a de Polignac number, because 404445623 - 2² = 404445619 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404445623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404445683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33215 + ... + 43727.

It is an arithmetic number, because the mean of its divisors is an integer number (28009296).

Almost surely, 2^404445623 is an apocalyptic number.

404445623 is a deficient number, since it is larger than the sum of its proper divisors (43703113).

404445623 is a wasteful number, since it uses less digits than its factorization.

404445623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10634.

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 404445623 is about 20110.8334735286. The cubic root of 404445623 is about 739.5258851254.

The spelling of 404445623 in words is "four hundred four million, four hundred forty-five thousand, six hundred twenty-three".