1299664 has 20 divisors (see below), whose sum is σ = 2605860. Its totient is φ = 627200.

The previous prime is 1299653. The next prime is 1299673. The reversal of 1299664 is 4669921.

It can be written as a sum of positive squares in 2 ways, for example, as 672400 + 627264 = 820^2 + 792^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937 + ... + 1864.

It is an arithmetic number, because the mean of its divisors is an integer number (130293).

2^1299664 is an apocalyptic number.

It is an amenable number.

1299664 is an abundant number, since it is smaller than the sum of its proper divisors (1306196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1299664 is a wasteful number, since it uses less digits than its factorization.

1299664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838 (or 2832 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 1299664 is about 1140.0280698299. The cubic root of 1299664 is about 109.1298847265.

It can be divided in two parts, 12996 and 64, that multiplied together give a square (831744 = 912²).

The spelling of 1299664 in words is "one million, two hundred ninety-nine thousand, six hundred sixty-four".