399642429 has 8 divisors (see below), whose sum is σ = 532949760. Its totient is φ = 266381696.

The previous prime is 399642413. The next prime is 399642431. The reversal of 399642429 is 924246993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399642429 - 2⁴ = 399642413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399602429) 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 7 ways as a sum of consecutive naturals, for example, 23629 + ... + 36845.

It is an arithmetic number, because the mean of its divisors is an integer number (66618720).

Almost surely, 2^399642429 is an apocalyptic number.

It is an amenable number.

399642429 is a deficient number, since it is larger than the sum of its proper divisors (133307331).

399642429 is a wasteful number, since it uses less digits than its factorization.

399642429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23299.

The product of its digits is 839808, while the sum is 48.

The square root of 399642429 is about 19991.0587263406. The cubic root of 399642429 is about 736.5866838037.

The spelling of 399642429 in words is "three hundred ninety-nine million, six hundred forty-two thousand, four hundred twenty-nine".