399061 has 4 divisors (see below), whose sum is σ = 429772. Its totient is φ = 368352.

The previous prime is 399059. The next prime is 399067. The reversal of 399061 is 160993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46225 + 352836 = 215^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 399061 - 2¹ = 399059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15336 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (107443).

2³⁹⁹⁰⁶¹ is an apocalyptic number.

It is an amenable number.

399061 is a deficient number, since it is larger than the sum of its proper divisors (30711).

399061 is a wasteful number, since it uses less digits than its factorization.

399061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30710.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 399061 is about 631.7127511773. The cubic root of 399061 is about 73.6229297058.

The spelling of 399061 in words is "three hundred ninety-nine thousand, sixty-one".