404252215 has 4 divisors (see below), whose sum is σ = 485102664. Its totient is φ = 323401768.

The previous prime is 404252213. The next prime is 404252221. The reversal of 404252215 is 512252404.

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

It is a cyclic number.

It is not a de Polignac number, because 404252215 - 2¹ = 404252213 is a prime.

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 404252215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404252213) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40425217 + ... + 40425226.

It is an arithmetic number, because the mean of its divisors is an integer number (121275666).

Almost surely, 2^404252215 is an apocalyptic number.

404252215 is a deficient number, since it is larger than the sum of its proper divisors (80850449).

404252215 is an equidigital number, since it uses as much as digits as its factorization.

404252215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80850448.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 404252215 is about 20106.0243459516. The cubic root of 404252215 is about 739.4079846220.

The spelling of 404252215 in words is "four hundred four million, two hundred fifty-two thousand, two hundred fifteen".