399699343 has 4 divisors (see below), whose sum is σ = 400122360. Its totient is φ = 399276328.

The previous prime is 399699331. The next prime is 399699347. The reversal of 399699343 is 343996993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399699343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399699347) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 210088 + ... + 211981.

It is an arithmetic number, because the mean of its divisors is an integer number (100030590).

Almost surely, 2^399699343 is an apocalyptic number.

399699343 is a deficient number, since it is larger than the sum of its proper divisors (423017).

399699343 is an equidigital number, since it uses as much as digits as its factorization.

399699343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423016.

The product of its digits is 4251528, while the sum is 55.

The square root of 399699343 is about 19992.4821620528. The cubic root of 399699343 is about 736.6216484801.

The spelling of 399699343 in words is "three hundred ninety-nine million, six hundred ninety-nine thousand, three hundred forty-three".