1279664 has 10 divisors (see below), whose sum is σ = 2479380. Its totient is φ = 639824.

The previous prime is 1279661. The next prime is 1279667. The reversal of 1279664 is 4669721.

It is an interprime number because it is at equal distance from previous prime (1279661) and next prime (1279667).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1279661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39974 + ... + 40005.

It is an arithmetic number, because the mean of its divisors is an integer number (247938).

2^1279664 is an apocalyptic number.

It is an amenable number.

1279664 is a deficient number, since it is larger than the sum of its proper divisors (1199716).

1279664 is an equidigital number, since it uses as much as digits as its factorization.

1279664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79987 (or 79981 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 1279664 is about 1131.2223477283. Note that the first 3 decimals coincide. The cubic root of 1279664 is about 108.5672033707.

The spelling of 1279664 in words is "one million, two hundred seventy-nine thousand, six hundred sixty-four".