3999957940247 has 2 divisors, whose sum is σ = 3999957940248. Its totient is φ = 3999957940246.

The previous prime is 3999957940171. The next prime is 3999957940271. The reversal of 3999957940247 is 7420497599993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3999957940247 - 2²² = 3999953745943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999957940547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999978970123 + 1999978970124.

It is an arithmetic number, because the mean of its divisors is an integer number (1999978970124).

Almost surely, 2^{3999957940247} is an apocalyptic number.

3999957940247 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999957940247 is an equidigital number, since it uses as much as digits as its factorization.

3999957940247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1388832480, while the sum is 77.

The spelling of 3999957940247 in words is "three trillion, nine hundred ninety-nine billion, nine hundred fifty-seven million, nine hundred forty thousand, two hundred forty-seven".