399026 has 8 divisors (see below), whose sum is σ = 603504. Its totient is φ = 197860.

The previous prime is 399023. The next prime is 399031. The reversal of 399026 is 620993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 399026.

It is not an unprimeable number, because it can be changed into a prime (399023) 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, 500 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (75438).

2³⁹⁹⁰²⁶ is an apocalyptic number.

399026 is a deficient number, since it is larger than the sum of its proper divisors (204478).

399026 is a wasteful number, since it uses less digits than its factorization.

399026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 399026 is about 631.6850481055. The cubic root of 399026 is about 73.6207772547.

It can be divided in two parts, 3990 and 26, that multiplied together give a triangular number (103740 = T₄₅₅).

The spelling of 399026 in words is "three hundred ninety-nine thousand, twenty-six".