399922829 has 4 divisors (see below), whose sum is σ = 400588860. Its totient is φ = 399256800.

The previous prime is 399922823. The next prime is 399922837. The reversal of 399922829 is 928229993.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243297604 + 156625225 = 15598^2 + 12515^2 .

It is a cyclic number.

It is not a de Polignac number, because 399922829 - 2⁴ = 399922813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399922823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332114 + ... + 333315.

It is an arithmetic number, because the mean of its divisors is an integer number (100147215).

Almost surely, 2^399922829 is an apocalyptic number.

It is an amenable number.

399922829 is a deficient number, since it is larger than the sum of its proper divisors (666031).

399922829 is an equidigital number, since it uses as much as digits as its factorization.

399922829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666030.

The product of its digits is 1259712, while the sum is 53.

The square root of 399922829 is about 19998.0706319385. The cubic root of 399922829 is about 736.7589132814.

The spelling of 399922829 in words is "three hundred ninety-nine million, nine hundred twenty-two thousand, eight hundred twenty-nine".