1047872865 has 16 divisors (see below), whose sum is σ = 1805565888. Its totient is φ = 515875776.

The previous prime is 1047872851. The next prime is 1047872867. The reversal of 1047872865 is 5682787401.

It is not a de Polignac number, because 1047872865 - 2¹⁰ = 1047871841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1047872867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686659 + ... + 2687048.

It is an arithmetic number, because the mean of its divisors is an integer number (112847868).

Almost surely, 2^1047872865 is an apocalyptic number.

1047872865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1047872865 is a deficient number, since it is larger than the sum of its proper divisors (757693023).

1047872865 is a wasteful number, since it uses less digits than its factorization.

1047872865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373728.

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 1047872865 is about 32370.8644462887. The cubic root of 1047872865 is about 1015.7095397115.

The spelling of 1047872865 in words is "one billion, forty-seven million, eight hundred seventy-two thousand, eight hundred sixty-five".