400745881 has 8 divisors (see below), whose sum is σ = 405909000. Its totient is φ = 395606400.

The previous prime is 400745869. The next prime is 400745887. The reversal of 400745881 is 188547004.

It can be written as a sum of positive squares in 4 ways, for example, as 224520256 + 176225625 = 14984^2 + 13275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400745881 - 2¹⁵ = 400713113 is a prime.

It is a super-2 number, since 2×400745881² = 321194522276932322, 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 400745881.

It is not an unprimeable number, because it can be changed into a prime (400745887) 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 7 ways as a sum of consecutive naturals, for example, 29565 + ... + 40933.

It is an arithmetic number, because the mean of its divisors is an integer number (50738625).

Almost surely, 2^400745881 is an apocalyptic number.

It is an amenable number.

400745881 is a deficient number, since it is larger than the sum of its proper divisors (5163119).

400745881 is a wasteful number, since it uses less digits than its factorization.

400745881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11819.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 400745881 is about 20018.6383403068. The cubic root of 400745881 is about 737.2639902100.

The spelling of 400745881 in words is "four hundred million, seven hundred forty-five thousand, eight hundred eighty-one".