399767663 has 2 divisors, whose sum is σ = 399767664. Its totient is φ = 399767662.

The previous prime is 399767651. The next prime is 399767677. The reversal of 399767663 is 366767993.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (366767993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399767663 - 2¹⁰ = 399766639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399767599 and 399767608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399767633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199883831 + 199883832.

It is an arithmetic number, because the mean of its divisors is an integer number (199883832).

Almost surely, 2^399767663 is an apocalyptic number.

399767663 is a deficient number, since it is larger than the sum of its proper divisors (1).

399767663 is an equidigital number, since it uses as much as digits as its factorization.

399767663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 56.

The square root of 399767663 is about 19994.1907313099. The cubic root of 399767663 is about 736.6636159612.

The spelling of 399767663 in words is "three hundred ninety-nine million, seven hundred sixty-seven thousand, six hundred sixty-three".