1373953999 has 4 divisors (see below), whose sum is σ = 1498858920. Its totient is φ = 1249049080.

The previous prime is 1373953981. The next prime is 1373954009. The reversal of 1373953999 is 9993593731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9993593731 = 11 ⋅908508521.

It is a cyclic number.

It is not a de Polignac number, because 1373953999 - 2⁷ = 1373953871 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 (1373953499) 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, 62452444 + ... + 62452465.

It is an arithmetic number, because the mean of its divisors is an integer number (374714730).

Almost surely, 2^1373953999 is an apocalyptic number.

1373953999 is a deficient number, since it is larger than the sum of its proper divisors (124904921).

1373953999 is a wasteful number, since it uses less digits than its factorization.

1373953999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124904920.

The product of its digits is 6200145, while the sum is 58.

The square root of 1373953999 is about 37066.8854774717. The cubic root of 1373953999 is about 1111.7079997649.

The spelling of 1373953999 in words is "one billion, three hundred seventy-three million, nine hundred fifty-three thousand, nine hundred ninety-nine".