401040865 has 8 divisors (see below), whose sum is σ = 481356648. Its totient is φ = 320760960.

The previous prime is 401040859. The next prime is 401040869. The reversal of 401040865 is 568040104.

It can be written as a sum of positive squares in 4 ways, for example, as 160883856 + 240157009 = 12684^2 + 15497^2 .

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

It is not a de Polignac number, because 401040865 - 2¹³ = 401032673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401040869) 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, 37899 + ... + 47311.

It is an arithmetic number, because the mean of its divisors is an integer number (60169581).

Almost surely, 2^401040865 is an apocalyptic number.

It is an amenable number.

401040865 is a deficient number, since it is larger than the sum of its proper divisors (80315783).

401040865 is an equidigital number, since it uses as much as digits as its factorization.

401040865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17939.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 401040865 is about 20026.0047188649. The cubic root of 401040865 is about 737.4448427580. Note that the first 3 decimals are identical.

Adding to 401040865 its reverse (568040104), we get a palindrome (969080969).

The spelling of 401040865 in words is "four hundred one million, forty thousand, eight hundred sixty-five".