399149 has 2 divisors, whose sum is σ = 399150. Its totient is φ = 399148.

The previous prime is 399137. The next prime is 399151. The reversal of 399149 is 941993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 33124 = 605^2 + 182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399149 is a prime.

Together with 399151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (392149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199574 + 199575.

It is an arithmetic number, because the mean of its divisors is an integer number (199575).

2³⁹⁹¹⁴⁹ is an apocalyptic number.

It is an amenable number.

399149 is a deficient number, since it is larger than the sum of its proper divisors (1).

399149 is an equidigital number, since it uses as much as digits as its factorization.

399149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 399149 is about 631.7823992483. The cubic root of 399149 is about 73.6283410269.

The spelling of 399149 in words is "three hundred ninety-nine thousand, one hundred forty-nine".