399578906699 has 16 divisors (see below), whose sum is σ = 463848949440. Its totient is φ = 337144905600.

The previous prime is 399578906677. The next prime is 399578906731. The reversal of 399578906699 is 996609875993.

It is a cyclic number.

It is not a de Polignac number, because 399578906699 - 2²⁸ = 399310471243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399578906399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511144 + ... + 1755765.

It is an arithmetic number, because the mean of its divisors is an integer number (28990559340).

Almost surely, 2^399578906699 is an apocalyptic number.

399578906699 is a deficient number, since it is larger than the sum of its proper divisors (64270042741).

399578906699 is a wasteful number, since it uses less digits than its factorization.

399578906699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267190.

The product of its (nonzero) digits is 1785641760, while the sum is 80.

The spelling of 399578906699 in words is "three hundred ninety-nine billion, five hundred seventy-eight million, nine hundred six thousand, six hundred ninety-nine".