399696743 has 2 divisors, whose sum is σ = 399696744. Its totient is φ = 399696742.

The previous prime is 399696727. The next prime is 399696761. The reversal of 399696743 is 347696993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399696743 - 2⁴ = 399696727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399696793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199848371 + 199848372.

It is an arithmetic number, because the mean of its divisors is an integer number (199848372).

Almost surely, 2^399696743 is an apocalyptic number.

399696743 is a deficient number, since it is larger than the sum of its proper divisors (1).

399696743 is an equidigital number, since it uses as much as digits as its factorization.

399696743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 56.

The square root of 399696743 is about 19992.4171375049. The cubic root of 399696743 is about 736.6200512625.

The spelling of 399696743 in words is "three hundred ninety-nine million, six hundred ninety-six thousand, seven hundred forty-three".