399929999 has 8 divisors (see below), whose sum is σ = 457488288. Its totient is φ = 342478080.

The previous prime is 399929963. The next prime is 399930001. The reversal of 399929999 is 999929993.

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

It is not a de Polignac number, because 399929999 - 2²⁸ = 131494543 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 (399929099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18362 + ... + 33719.

It is an arithmetic number, because the mean of its divisors is an integer number (57186036).

Almost surely, 2^399929999 is an apocalyptic number.

399929999 is a deficient number, since it is larger than the sum of its proper divisors (57558289).

399929999 is a wasteful number, since it uses less digits than its factorization.

399929999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53185.

The product of its digits is 28697814, while the sum is 68.

The square root of 399929999 is about 19998.2498984286. The cubic root of 399929999 is about 736.7633162391.

The spelling of 399929999 in words is "three hundred ninety-nine million, nine hundred twenty-nine thousand, nine hundred ninety-nine".