373991 has 4 divisors (see below), whose sum is σ = 380184. Its totient is φ = 367800.

The previous prime is 373987. The next prime is 373999. The reversal of 373991 is 199373.

It is a happy number.

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 373991 - 2² = 373987 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 (373999) 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, 3005 + ... + 3126.

It is an arithmetic number, because the mean of its divisors is an integer number (95046).

2³⁷³⁹⁹¹ is an apocalyptic number.

373991 is a deficient number, since it is larger than the sum of its proper divisors (6193).

373991 is an equidigital number, since it uses as much as digits as its factorization.

373991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192.

The product of its digits is 5103, while the sum is 32.

The square root of 373991 is about 611.5480357257. The cubic root of 373991 is about 72.0477435398.

The spelling of 373991 in words is "three hundred seventy-three thousand, nine hundred ninety-one".