1390267665 has 64 divisors (see below), whose sum is σ = 2514758400. Its totient is φ = 728640000.

The previous prime is 1390267597. The next prime is 1390267687. The reversal of 1390267665 is 5667620931.

It is not a de Polignac number, because 1390267665 - 2¹⁷ = 1390136593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1390267665.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3015535 + ... + 3015995.

It is an arithmetic number, because the mean of its divisors is an integer number (39293100).

Almost surely, 2^1390267665 is an apocalyptic number.

1390267665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1390267665 is a deficient number, since it is larger than the sum of its proper divisors (1124490735).

1390267665 is a wasteful number, since it uses less digits than its factorization.

1390267665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 1390267665 is about 37286.2932590516. The cubic root of 1390267665 is about 1116.0906606311.

The spelling of 1390267665 in words is "one billion, three hundred ninety million, two hundred sixty-seven thousand, six hundred sixty-five".