2381931 has 6 divisors (see below), whose sum is σ = 3440580. Its totient is φ = 1587948.

The previous prime is 2381909. The next prime is 2381941. The reversal of 2381931 is 1391832.

It is not a de Polignac number, because 2381931 - 2¹⁰ = 2380907 is a prime.

It is a super-2 number, since 2×2381931² = 11347190577522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2381895 and 2381904.

It is not an unprimeable number, because it can be changed into a prime (2381941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 132321 + ... + 132338.

It is an arithmetic number, because the mean of its divisors is an integer number (573430).

2^2381931 is an apocalyptic number.

2381931 is a deficient number, since it is larger than the sum of its proper divisors (1058649).

2381931 is a wasteful number, since it uses less digits than its factorization.

2381931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264665 (or 264662 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2381931 is about 1543.3505758576. The cubic root of 2381931 is about 133.5497436980.

Subtracting from 2381931 its reverse (1391832), we obtain a palindrome (990099).

The spelling of 2381931 in words is "two million, three hundred eighty-one thousand, nine hundred thirty-one".