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399001 = 3161211

399001 has 8 divisors (see below), whose sum is σ = 420608. Its totient is φ = 378000.

The previous prime is 398989. The next prime is 399023. The reversal of 399001 is 100993.

Adding to 399001 its reverse (100993), we get a palindrome (499994).

399001 is nontrivially palindromic in base 5.

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

It is a 3-Lehmer number, since φ(399001) divides (399001-1)3.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 399001 - 25 = 398969 is a prime.

It is a deceptive number, since it divides R399000.

It is not an unprimeable number, because it can be changed into a prime (399031) 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, 1786 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (52576).

It is a Poulet number, since it divides 2399000-1.

2399001 is an apocalyptic number.

399001 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

399001 is the 400-th centered pentagonal number.

It is an amenable number.

399001 is a deficient number, since it is larger than the sum of its proper divisors (21607).

399001 is a wasteful number, since it uses less digits than its factorization.

399001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 399001 is about 631.6652594531. The cubic root of 399001 is about 73.6192397126.

The spelling of 399001 in words is "three hundred ninety-nine thousand, one".

Divisors: 1 31 61 211 1891 6541 12871 399001