379991 has 4 divisors (see below), whose sum is σ = 388872. Its totient is φ = 371112.

The previous prime is 379979. The next prime is 379993. The reversal of 379991 is 199973.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199973 = 311 ⋅643.

It is a cyclic number.

It is not a de Polignac number, because 379991 - 2⁶ = 379927 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 (379993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4376 + ... + 4461.

It is an arithmetic number, because the mean of its divisors is an integer number (97218).

2³⁷⁹⁹⁹¹ is an apocalyptic number.

379991 is a deficient number, since it is larger than the sum of its proper divisors (8881).

379991 is an equidigital number, since it uses as much as digits as its factorization.

379991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880.

The product of its digits is 15309, while the sum is 38.

The square root of 379991 is about 616.4341002897. The cubic root of 379991 is about 72.4309926018.

The spelling of 379991 in words is "three hundred seventy-nine thousand, nine hundred ninety-one".