400466581 has 2 divisors, whose sum is σ = 400466582. Its totient is φ = 400466580.

The previous prime is 400466543. The next prime is 400466609. The reversal of 400466581 is 185664004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275228100 + 125238481 = 16590^2 + 11191^2 .

It is a cyclic number.

It is not a de Polignac number, because 400466581 - 2²⁵ = 366912149 is a prime.

It is a super-2 number, since 2×400466581² = 320746964995659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400466531) 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 as a sum of consecutive naturals, namely, 200233290 + 200233291.

It is an arithmetic number, because the mean of its divisors is an integer number (200233291).

Almost surely, 2^400466581 is an apocalyptic number.

It is an amenable number.

400466581 is a deficient number, since it is larger than the sum of its proper divisors (1).

400466581 is an equidigital number, since it uses as much as digits as its factorization.

400466581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 400466581 is about 20011.6611254538. The cubic root of 400466581 is about 737.0926715940.

The spelling of 400466581 in words is "four hundred million, four hundred sixty-six thousand, five hundred eighty-one".