379990981 has 4 divisors (see below), whose sum is σ = 396512352. Its totient is φ = 363469612.

The previous prime is 379990943. The next prime is 379990991. The reversal of 379990981 is 189099973.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189099973 = 631 ⋅299683.

It is a cyclic number.

It is not a de Polignac number, because 379990981 - 2⁹ = 379990469 is a prime.

It is a super-2 number, since 2×379990981² = 288786291282684722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (379990931) 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, 8260651 + ... + 8260696.

It is an arithmetic number, because the mean of its divisors is an integer number (99128088).

Almost surely, 2^379990981 is an apocalyptic number.

It is an amenable number.

379990981 is a deficient number, since it is larger than the sum of its proper divisors (16521371).

379990981 is a wasteful number, since it uses less digits than its factorization.

379990981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16521370.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 379990981 is about 19493.3573557764. The cubic root of 379990981 is about 724.3099139455.

The spelling of 379990981 in words is "three hundred seventy-nine million, nine hundred ninety thousand, nine hundred eighty-one".