2638943999 has 2 divisors, whose sum is σ = 2638944000. Its totient is φ = 2638943998.

The previous prime is 2638943987. The next prime is 2638944043. The reversal of 2638943999 is 9993498362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2638943999 - 2⁸ = 2638943743 is a prime.

It is a super-2 number, since 2×2638943999² = 13928050859716224002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638943929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319471999 + 1319472000.

It is an arithmetic number, because the mean of its divisors is an integer number (1319472000).

Almost surely, 2^2638943999 is an apocalyptic number.

2638943999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638943999 is an equidigital number, since it uses as much as digits as its factorization.

2638943999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22674816, while the sum is 62.

The square root of 2638943999 is about 51370.6530910402. The cubic root of 2638943999 is about 1381.9003432990.

The spelling of 2638943999 in words is "two billion, six hundred thirty-eight million, nine hundred forty-three thousand, nine hundred ninety-nine".