2391993 has 12 divisors (see below), whose sum is σ = 3512548. Its totient is φ = 1568160.

The previous prime is 2391979. The next prime is 2391997. The reversal of 2391993 is 3991932.

It can be written as a sum of positive squares in 2 ways, for example, as 1375929 + 1016064 = 1173^2 + 1008^2 .

It is not a de Polignac number, because 2391993 - 2⁸ = 2391737 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391997) 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, 1630 + ... + 2727.

2^2391993 is an apocalyptic number.

It is an amenable number.

2391993 is a deficient number, since it is larger than the sum of its proper divisors (1120555).

2391993 is a wasteful number, since it uses less digits than its factorization.

2391993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424 (or 4421 counting only the distinct ones).

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

The square root of 2391993 is about 1546.6069313177. The cubic root of 2391993 is about 133.7375310821.

The spelling of 2391993 in words is "two million, three hundred ninety-one thousand, nine hundred ninety-three".