1373999 has 4 divisors (see below), whose sum is σ = 1498920. Its totient is φ = 1249080.

The previous prime is 1373989. The next prime is 1374007. The reversal of 1373999 is 9993731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993731 = 11 ⋅908521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1373999 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 (1373959) 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, 62444 + ... + 62465.

It is an arithmetic number, because the mean of its divisors is an integer number (374730).

2^1373999 is an apocalyptic number.

1373999 is a deficient number, since it is larger than the sum of its proper divisors (124921).

1373999 is a wasteful number, since it uses less digits than its factorization.

1373999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124920.

The product of its digits is 45927, while the sum is 41.

The square root of 1373999 is about 1172.1770344108. The cubic root of 1373999 is about 111.1720136859.

The spelling of 1373999 in words is "one million, three hundred seventy-three thousand, nine hundred ninety-nine".