400755865 has 8 divisors (see below), whose sum is σ = 481153608. Its totient is φ = 320440320.

The previous prime is 400755863. The next prime is 400755871. The reversal of 400755865 is 568557004.

It can be written as a sum of positive squares in 4 ways, for example, as 126157824 + 274598041 = 11232^2 + 16571^2 .

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

It is not a de Polignac number, because 400755865 - 2¹ = 400755863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400755863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9256 + ... + 29785.

It is an arithmetic number, because the mean of its divisors is an integer number (60144201).

Almost surely, 2^400755865 is an apocalyptic number.

It is an amenable number.

400755865 is a deficient number, since it is larger than the sum of its proper divisors (80397743).

400755865 is a wasteful number, since it uses less digits than its factorization.

400755865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41099.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 400755865 is about 20018.8877063637. The cubic root of 400755865 is about 737.2701127787.

The spelling of 400755865 in words is "four hundred million, seven hundred fifty-five thousand, eight hundred sixty-five".