400905319 has 4 divisors (see below), whose sum is σ = 401120560. Its totient is φ = 400690080.

The previous prime is 400905313. The next prime is 400905389. The reversal of 400905319 is 913509004.

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 400905319 - 2³ = 400905311 is a prime.

It is a super-2 number, since 2×400905319² = 321450149604983522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400905311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104802 + ... + 108559.

It is an arithmetic number, because the mean of its divisors is an integer number (100280140).

Almost surely, 2^400905319 is an apocalyptic number.

400905319 is a deficient number, since it is larger than the sum of its proper divisors (215241).

400905319 is a wasteful number, since it uses less digits than its factorization.

400905319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215240.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 400905319 is about 20022.6201831828. The cubic root of 400905319 is about 737.3617515064.

The spelling of 400905319 in words is "four hundred million, nine hundred five thousand, three hundred nineteen".