399426 has 8 divisors (see below), whose sum is σ = 798864. Its totient is φ = 133140.

The previous prime is 399409. The next prime is 399433. The reversal of 399426 is 624993.

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

399426 is an admirable number.

It is a super-2 number, since 2×399426² = 319082258952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33280 + ... + 33291.

It is an arithmetic number, because the mean of its divisors is an integer number (99858).

2³⁹⁹⁴²⁶ is an apocalyptic number.

399426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399426 is a wasteful number, since it uses less digits than its factorization.

399426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66576.

The product of its digits is 11664, while the sum is 33.

The square root of 399426 is about 632.0015822765. The cubic root of 399426 is about 73.6453691997.

The spelling of 399426 in words is "three hundred ninety-nine thousand, four hundred twenty-six".