1376399 has 4 divisors (see below), whose sum is σ = 1380264. Its totient is φ = 1372536.

The previous prime is 1376393. The next prime is 1376407. The reversal of 1376399 is 9936731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9936731 = 7 ⋅1419533.

It is a cyclic number.

It is not a de Polignac number, because 1376399 - 2⁴ = 1376383 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 (1376393) 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, 1337 + ... + 2130.

It is an arithmetic number, because the mean of its divisors is an integer number (345066).

2^1376399 is an apocalyptic number.

1376399 is a deficient number, since it is larger than the sum of its proper divisors (3865).

1376399 is an equidigital number, since it uses as much as digits as its factorization.

1376399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864.

The product of its digits is 30618, while the sum is 38.

The square root of 1376399 is about 1173.2003239004. The cubic root of 1376399 is about 111.2367050560.

The spelling of 1376399 in words is "one million, three hundred seventy-six thousand, three hundred ninety-nine".