399706049 has 2 divisors, whose sum is σ = 399706050. Its totient is φ = 399706048.

The previous prime is 399706003. The next prime is 399706051. The reversal of 399706049 is 940607993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361266049 + 38440000 = 19007^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 399706049 - 2²⁸ = 131270593 is a prime.

Together with 399706051, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399705994 and 399706012.

It is not a weakly prime, because it can be changed into another prime (399706849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199853024 + 199853025.

It is an arithmetic number, because the mean of its divisors is an integer number (199853025).

Almost surely, 2^399706049 is an apocalyptic number.

It is an amenable number.

399706049 is a deficient number, since it is larger than the sum of its proper divisors (1).

399706049 is an equidigital number, since it uses as much as digits as its factorization.

399706049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 399706049 is about 19992.6498743913. The cubic root of 399706049 is about 736.6257680408.

The spelling of 399706049 in words is "three hundred ninety-nine million, seven hundred six thousand, forty-nine".