399263747 has 2 divisors, whose sum is σ = 399263748. Its totient is φ = 399263746.

The previous prime is 399263713. The next prime is 399263789. The reversal of 399263747 is 747362993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399263747 - 2²⁰ = 398215171 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399263695 and 399263704.

It is not a weakly prime, because it can be changed into another prime (399265747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199631873 + 199631874.

It is an arithmetic number, because the mean of its divisors is an integer number (199631874).

Almost surely, 2^399263747 is an apocalyptic number.

399263747 is a deficient number, since it is larger than the sum of its proper divisors (1).

399263747 is an equidigital number, since it uses as much as digits as its factorization.

399263747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 50.

The square root of 399263747 is about 19981.5851973761. The cubic root of 399263747 is about 736.3539588762.

The spelling of 399263747 in words is "three hundred ninety-nine million, two hundred sixty-three thousand, seven hundred forty-seven".