399976747 has 2 divisors, whose sum is σ = 399976748. Its totient is φ = 399976746.

The previous prime is 399976741. The next prime is 399976813. The reversal of 399976747 is 747679993.

It is a weak prime.

It is an emirp because it is prime and its reverse (747679993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399976747 - 2¹⁵ = 399943979 is a prime.

It is not a weakly prime, because it can be changed into another prime (399976741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199988373 + 199988374.

It is an arithmetic number, because the mean of its divisors is an integer number (199988374).

Almost surely, 2^399976747 is an apocalyptic number.

399976747 is a deficient number, since it is larger than the sum of its proper divisors (1).

399976747 is an equidigital number, since it uses as much as digits as its factorization.

399976747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18003384, while the sum is 61.

The square root of 399976747 is about 19999.4186665513. The cubic root of 399976747 is about 736.7920219873.

The spelling of 399976747 in words is "three hundred ninety-nine million, nine hundred seventy-six thousand, seven hundred forty-seven".