1276399 has 4 divisors (see below), whose sum is σ = 1300536. Its totient is φ = 1252264.

The previous prime is 1276397. The next prime is 1276409. The reversal of 1276399 is 9936721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1276399 - 2¹ = 1276397 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276397) 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, 11989 + ... + 12094.

It is an arithmetic number, because the mean of its divisors is an integer number (325134).

2^1276399 is an apocalyptic number.

1276399 is a deficient number, since it is larger than the sum of its proper divisors (24137).

1276399 is an equidigital number, since it uses as much as digits as its factorization.

1276399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24136.

The product of its digits is 20412, while the sum is 37.

The square root of 1276399 is about 1129.7782968353. The cubic root of 1276399 is about 108.4747900967.

The spelling of 1276399 in words is "one million, two hundred seventy-six thousand, three hundred ninety-nine".