1279857 has 16 divisors (see below), whose sum is σ = 1808640. Its totient is φ = 803712.

The previous prime is 1279853. The next prime is 1279871. The reversal of 1279857 is 7589721.

It is not a de Polignac number, because 1279857 - 2² = 1279853 is a prime.

It is a d-powerful number, because it can be written as 1 + 2¹⁶ + 7 + 9² + 8² + 5⁸ + 7⁷ .

Its product of digits (35280) is a multiple of the sum of its prime divisors (392).

1279857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1279853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3933 + ... + 4245.

It is an arithmetic number, because the mean of its divisors is an integer number (113040).

2^1279857 is an apocalyptic number.

It is an amenable number.

1279857 is a deficient number, since it is larger than the sum of its proper divisors (528783).

1279857 is a wasteful number, since it uses less digits than its factorization.

1279857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its digits is 35280, while the sum is 39.

The square root of 1279857 is about 1131.3076504647. The cubic root of 1279857 is about 108.5726611620.

The spelling of 1279857 in words is "one million, two hundred seventy-nine thousand, eight hundred fifty-seven".