1399463865 has 64 divisors (see below), whose sum is σ = 2659668480. Its totient is φ = 696453120.

The previous prime is 1399463861. The next prime is 1399463873. The reversal of 1399463865 is 5683649931.

1399463865 is a `hidden beast` number, since 13 + 99 + 463 + 86 + 5 = 666.

It is not a de Polignac number, because 1399463865 - 2² = 1399463861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1399463861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121809 + ... + 132801.

It is an arithmetic number, because the mean of its divisors is an integer number (41557320).

Almost surely, 2^1399463865 is an apocalyptic number.

1399463865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1399463865 is a deficient number, since it is larger than the sum of its proper divisors (1260204615).

1399463865 is a wasteful number, since it uses less digits than its factorization.

1399463865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11071 (or 11065 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1399463865 is about 37409.4087764028. The cubic root of 1399463865 is about 1118.5461218734.

The spelling of 1399463865 in words is "one billion, three hundred ninety-nine million, four hundred sixty-three thousand, eight hundred sixty-five".