2397991 has 2 divisors, whose sum is σ = 2397992. Its totient is φ = 2397990.

The previous prime is 2397961. The next prime is 2398001. The reversal of 2397991 is 1997932.

2397991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2397991 - 2¹³ = 2389799 is a prime.

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2397931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1198995 + 1198996.

It is an arithmetic number, because the mean of its divisors is an integer number (1198996).

2^2397991 is an apocalyptic number.

2397991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2397991 is an equidigital number, since it uses as much as digits as its factorization.

2397991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 2397991 is about 1548.5448007726. The cubic root of 2397991 is about 133.8492215100.

The spelling of 2397991 in words is "two million, three hundred ninety-seven thousand, nine hundred ninety-one".