399949706 has 16 divisors (see below), whose sum is σ = 647917704. Its totient is φ = 184065024.

The previous prime is 399949679. The next prime is 399949729. The reversal of 399949706 is 607949993.

It can be written as a sum of positive squares in 4 ways, for example, as 208542481 + 191407225 = 14441^2 + 13835^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12611 + ... + 30966.

Almost surely, 2^399949706 is an apocalyptic number.

399949706 is a deficient number, since it is larger than the sum of its proper divisors (247967998).

399949706 is a wasteful number, since it uses less digits than its factorization.

399949706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43945.

The product of its (nonzero) digits is 3306744, while the sum is 56.

The square root of 399949706 is about 19998.7426104743. The cubic root of 399949706 is about 736.7754176537.

The spelling of 399949706 in words is "three hundred ninety-nine million, nine hundred forty-nine thousand, seven hundred six".