1040400865 has 16 divisors (see below), whose sum is σ = 1453759488. Its totient is φ = 699955776.

The previous prime is 1040400847. The next prime is 1040400877. The reversal of 1040400865 is 5680040401.

It is a cyclic number.

It is not a de Polignac number, because 1040400865 - 2⁹ = 1040400353 is a prime.

It is a super-3 number, since 3×1040400865³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278577 + ... + 282286.

It is an arithmetic number, because the mean of its divisors is an integer number (90859968).

Almost surely, 2^1040400865 is an apocalyptic number.

It is an amenable number.

1040400865 is a deficient number, since it is larger than the sum of its proper divisors (413358623).

1040400865 is an equidigital number, since it uses as much as digits as its factorization.

1040400865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560928.

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

The square root of 1040400865 is about 32255.2455423920. The cubic root of 1040400865 is about 1013.2895602220.

The spelling of 1040400865 in words is "one billion, forty million, four hundred thousand, eight hundred sixty-five".