2379981 has 4 divisors (see below), whose sum is σ = 3173312. Its totient is φ = 1586652.

The previous prime is 2379973. The next prime is 2379989. The reversal of 2379981 is 1899732.

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.

It is an interprime number because it is at equal distance from previous prime (2379973) and next prime (2379989).

It is not a de Polignac number, because 2379981 - 2³ = 2379973 is a prime.

It is a super-2 number, since 2×2379981² = 11328619120722, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2379989) 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, 396661 + ... + 396666.

It is an arithmetic number, because the mean of its divisors is an integer number (793328).

2^2379981 is an apocalyptic number.

It is an amenable number.

2379981 is a deficient number, since it is larger than the sum of its proper divisors (793331).

2379981 is an equidigital number, since it uses as much as digits as its factorization.

2379981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793330.

The product of its digits is 27216, while the sum is 39.

The square root of 2379981 is about 1542.7187041065. The cubic root of 2379981 is about 133.5132896476.

Subtracting from 2379981 its reverse (1899732), we obtain a square (480249 = 693²).

The spelling of 2379981 in words is "two million, three hundred seventy-nine thousand, nine hundred eighty-one".