404918623 has 2 divisors, whose sum is σ = 404918624. Its totient is φ = 404918622.

The previous prime is 404918603. The next prime is 404918641. The reversal of 404918623 is 326819404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404918623 - 2¹³ = 404910431 is a prime.

It is a super-2 number, since 2×404918623² = 327918182504432258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404918603) 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 as a sum of consecutive naturals, namely, 202459311 + 202459312.

It is an arithmetic number, because the mean of its divisors is an integer number (202459312).

Almost surely, 2^404918623 is an apocalyptic number.

404918623 is a deficient number, since it is larger than the sum of its proper divisors (1).

404918623 is an equidigital number, since it uses as much as digits as its factorization.

404918623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 404918623 is about 20122.5898681059. The cubic root of 404918623 is about 739.8140651675.

The spelling of 404918623 in words is "four hundred four million, nine hundred eighteen thousand, six hundred twenty-three".