399074747 has 2 divisors, whose sum is σ = 399074748. Its totient is φ = 399074746.

The previous prime is 399074719. The next prime is 399074777. The reversal of 399074747 is 747470993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399074747 - 2¹⁶ = 399009211 is a prime.

It is a super-2 number, since 2×399074747² = 318521307386228018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399074695 and 399074704.

It is not a weakly prime, because it can be changed into another prime (399074717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199537373 + 199537374.

It is an arithmetic number, because the mean of its divisors is an integer number (199537374).

Almost surely, 2^399074747 is an apocalyptic number.

399074747 is a deficient number, since it is larger than the sum of its proper divisors (1).

399074747 is an equidigital number, since it uses as much as digits as its factorization.

399074747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 50.

The square root of 399074747 is about 19976.8552830519. The cubic root of 399074747 is about 736.2377509269.

The spelling of 399074747 in words is "three hundred ninety-nine million, seventy-four thousand, seven hundred forty-seven".