399011 has 4 divisors (see below), whose sum is σ = 412800. Its totient is φ = 385224.

The previous prime is 398989. The next prime is 399023. The reversal of 399011 is 110993.

399011 = 103² + 104² + ... + 131².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110993 = 17 ⋅6529.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399011 is a prime.

It is a super-3 number, since 3×399011³ = 190579358333514993, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 6851 + ... + 6908.

It is an arithmetic number, because the mean of its divisors is an integer number (103200).

2³⁹⁹⁰¹¹ is an apocalyptic number.

399011 is a deficient number, since it is larger than the sum of its proper divisors (13789).

399011 is a wasteful number, since it uses less digits than its factorization.

399011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13788.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 399011 is about 631.6731749885. The cubic root of 399011 is about 73.6198547371.

The spelling of 399011 in words is "three hundred ninety-nine thousand, eleven".