404744581 has 4 divisors (see below), whose sum is σ = 405521964. Its totient is φ = 403967200.

The previous prime is 404744573. The next prime is 404744609. The reversal of 404744581 is 185447404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 266799556 + 137945025 = 16334^2 + 11745^2 .

It is a cyclic number.

It is not a de Polignac number, because 404744581 - 2³ = 404744573 is a prime.

It is a super-2 number, since 2×404744581² = 327636351697731122, which contains 22 as substring.

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 404744581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404744531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387910 + ... + 388951.

It is an arithmetic number, because the mean of its divisors is an integer number (101380491).

Almost surely, 2^404744581 is an apocalyptic number.

It is an amenable number.

404744581 is a deficient number, since it is larger than the sum of its proper divisors (777383).

404744581 is an equidigital number, since it uses as much as digits as its factorization.

404744581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777382.

The product of its (nonzero) digits is 71680, while the sum is 37.

The square root of 404744581 is about 20118.2648605689. The cubic root of 404744581 is about 739.7080544250.

The spelling of 404744581 in words is "four hundred four million, seven hundred forty-four thousand, five hundred eighty-one".