1018440865 has 16 divisors (see below), whose sum is σ = 1317325968. Its totient is φ = 751401216.

The previous prime is 1018440859. The next prime is 1018440877. The reversal of 1018440865 is 5680448101.

It can be written as a sum of positive squares in 8 ways, for example, as 263510289 + 754930576 = 16233^2 + 27476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018440865 - 2⁵ = 1018440833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72387 + ... + 85303.

It is an arithmetic number, because the mean of its divisors is an integer number (82332873).

Almost surely, 2^1018440865 is an apocalyptic number.

It is an amenable number.

1018440865 is a deficient number, since it is larger than the sum of its proper divisors (298885103).

1018440865 is a wasteful number, since it uses less digits than its factorization.

1018440865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14148.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1018440865 is about 31913.0203051983. The cubic root of 1018440865 is about 1006.1095523537.

Adding to 1018440865 its reverse (5680448101), we get a palindrome (6698888966).

The spelling of 1018440865 in words is "one billion, eighteen million, four hundred forty thousand, eight hundred sixty-five".