399641 has 8 divisors (see below), whose sum is σ = 445824. Its totient is φ = 355120.

The previous prime is 399617. The next prime is 399643. The reversal of 399641 is 146993.

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 399641 - 2⁶ = 399577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399598 and 399607.

It is not an unprimeable number, because it can be changed into a prime (399643) 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, 131 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (55728).

2³⁹⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

399641 is a deficient number, since it is larger than the sum of its proper divisors (46183).

399641 is a wasteful number, since it uses less digits than its factorization.

399641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831.

The product of its digits is 5832, while the sum is 32.

The square root of 399641 is about 632.1716539042. The cubic root of 399641 is about 73.6585805866.

The spelling of 399641 in words is "three hundred ninety-nine thousand, six hundred forty-one".