399650761 has 2 divisors, whose sum is σ = 399650762. Its totient is φ = 399650760.

The previous prime is 399650759. The next prime is 399650777. The reversal of 399650761 is 167056993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384905161 + 14745600 = 19619^2 + 3840^2 .

It is a cyclic number.

It is not a de Polignac number, because 399650761 - 2¹ = 399650759 is a prime.

Together with 399650759, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399650701) 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, 199825380 + 199825381.

It is an arithmetic number, because the mean of its divisors is an integer number (199825381).

Almost surely, 2^399650761 is an apocalyptic number.

It is an amenable number.

399650761 is a deficient number, since it is larger than the sum of its proper divisors (1).

399650761 is an equidigital number, since it uses as much as digits as its factorization.

399650761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 399650761 is about 19991.2671184195. The cubic root of 399650761 is about 736.5918027109.

The spelling of 399650761 in words is "three hundred ninety-nine million, six hundred fifty thousand, seven hundred sixty-one".