399801 has 8 divisors (see below), whose sum is σ = 540864. Its totient is φ = 262640.

The previous prime is 399793. The next prime is 399851. The reversal of 399801 is 108993.

It is a happy number.

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 399801 - 2³ = 399793 is a prime.

399801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (399851) 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, 726 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (67608).

2³⁹⁹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

399801 is a deficient number, since it is larger than the sum of its proper divisors (141063).

399801 is a wasteful number, since it uses less digits than its factorization.

399801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 399801 is about 632.2981891481. The cubic root of 399801 is about 73.6684092415.

The spelling of 399801 in words is "three hundred ninety-nine thousand, eight hundred one".