2393991 has 12 divisors (see below), whose sum is σ = 3661632. Its totient is φ = 1502016.

The previous prime is 2393987. The next prime is 2394017. The reversal of 2393991 is 1993932.

It is not a de Polignac number, because 2393991 - 2² = 2393987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2393971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7671 + ... + 7976.

It is an arithmetic number, because the mean of its divisors is an integer number (305136).

2^2393991 is an apocalyptic number.

2393991 is a deficient number, since it is larger than the sum of its proper divisors (1267641).

2393991 is a wasteful number, since it uses less digits than its factorization.

2393991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15670 (or 15667 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 2393991 is about 1547.2527266093. The cubic root of 2393991 is about 133.7747571140.

The spelling of 2393991 in words is "two million, three hundred ninety-three thousand, nine hundred ninety-one".