399481 has 2 divisors, whose sum is σ = 399482. Its totient is φ = 399480.

The previous prime is 399473. The next prime is 399491. The reversal of 399481 is 184993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266256 + 133225 = 516^2 + 365^2 .

It is an emirp because it is prime and its reverse (184993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399481 - 2³ = 399473 is a prime.

It is a super-2 number, since 2×399481² = 319170138722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199740 + 199741.

It is an arithmetic number, because the mean of its divisors is an integer number (199741).

2³⁹⁹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

399481 is a deficient number, since it is larger than the sum of its proper divisors (1).

399481 is an equidigital number, since it uses as much as digits as its factorization.

399481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 399481 is about 632.0450933280. The cubic root of 399481 is about 73.6487493080.

The spelling of 399481 in words is "three hundred ninety-nine thousand, four hundred eighty-one".