1277399 has 4 divisors (see below), whose sum is σ = 1279680. Its totient is φ = 1275120.

The previous prime is 1277387. The next prime is 1277429. The reversal of 1277399 is 9937721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9937721 = 1531 ⋅6491.

It is a cyclic number.

It is not a de Polignac number, because 1277399 - 2¹⁶ = 1211863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (319920).

2^1277399 is an apocalyptic number.

1277399 is a deficient number, since it is larger than the sum of its proper divisors (2281).

1277399 is an equidigital number, since it uses as much as digits as its factorization.

1277399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280.

The product of its digits is 23814, while the sum is 38.

The square root of 1277399 is about 1130.2207748931. The cubic root of 1277399 is about 108.5031110408.

The spelling of 1277399 in words is "one million, two hundred seventy-seven thousand, three hundred ninety-nine".