2396387981 has 4 divisors (see below), whose sum is σ = 2580725532. Its totient is φ = 2212050432.

The previous prime is 2396387933. The next prime is 2396388011. The reversal of 2396387981 is 1897836932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1108224100 + 1288163881 = 33290^2 + 35891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2396387981 is a prime.

It is a super-2 number, since 2×2396387981² = 11485350710962512722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2396387911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92168756 + ... + 92168781.

It is an arithmetic number, because the mean of its divisors is an integer number (645181383).

Almost surely, 2^2396387981 is an apocalyptic number.

It is an amenable number.

2396387981 is a deficient number, since it is larger than the sum of its proper divisors (184337551).

2396387981 is a wasteful number, since it uses less digits than its factorization.

2396387981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184337550.

The product of its digits is 3919104, while the sum is 56.

The square root of 2396387981 is about 48952.9159601346. The cubic root of 2396387981 is about 1338.1938950008.

The spelling of 2396387981 in words is "two billion, three hundred ninety-six million, three hundred eighty-seven thousand, nine hundred eighty-one".