1279725 has 24 divisors (see below), whose sum is σ = 2148672. Its totient is φ = 672000.

The previous prime is 1279703. The next prime is 1279727. The reversal of 1279725 is 5279721.

It is not a de Polignac number, because 1279725 - 2⁵ = 1279693 is a prime.

It is a d-powerful number, because it can be written as 1 + 2² + 7 + 9 + 7⁷ + 2¹⁶ + 5⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8400 + ... + 8550.

It is an arithmetic number, because the mean of its divisors is an integer number (89528).

2^1279725 is an apocalyptic number.

1279725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1279725 is a deficient number, since it is larger than the sum of its proper divisors (868947).

1279725 is a wasteful number, since it uses less digits than its factorization.

1279725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 272 counting only the distinct ones).

The product of its digits is 8820, while the sum is 33.

The square root of 1279725 is about 1131.2493093921. The cubic root of 1279725 is about 108.5689284314.

The spelling of 1279725 in words is "one million, two hundred seventy-nine thousand, seven hundred twenty-five".