399893 has 8 divisors (see below), whose sum is σ = 453600. Its totient is φ = 349488.

The previous prime is 399887. The next prime is 399899. The reversal of 399893 is 398993.

It is an interprime number because it is at equal distance from previous prime (399887) and next prime (399899).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399893 is a prime.

It is a super-2 number, since 2×399893² = 319828822898, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399899) 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, 563 + ... + 1056.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2³⁹⁹⁸⁹³ is an apocalyptic number.

It is an amenable number.

399893 is a deficient number, since it is larger than the sum of its proper divisors (53707).

399893 is a wasteful number, since it uses less digits than its factorization.

399893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its digits is 52488, while the sum is 41.

The square root of 399893 is about 632.3709354485. The cubic root of 399893 is about 73.6740595307.

Subtracting from 399893 its reverse (398993), we obtain a square (900 = 30²).

The spelling of 399893 in words is "three hundred ninety-nine thousand, eight hundred ninety-three".