399675 has 18 divisors (see below), whose sum is σ = 669972. Its totient is φ = 210240.

The previous prime is 399667. The next prime is 399677. The reversal of 399675 is 576993.

399675 = T₆₆ + T₆₇ + ... + T₁₃₈.

It is not a de Polignac number, because 399675 - 2³ = 399667 is a prime.

Its product of digits (51030) is a multiple of the sum of its prime divisors (81).

399675 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (399677) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5439 + ... + 5511.

2³⁹⁹⁶⁷⁵ is an apocalyptic number.

399675 is a deficient number, since it is larger than the sum of its proper divisors (270297).

399675 is an equidigital number, since it uses as much as digits as its factorization.

399675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 81 counting only the distinct ones).

The product of its digits is 51030, while the sum is 39.

The square root of 399675 is about 632.1985447626. The cubic root of 399675 is about 73.6606693952.

The spelling of 399675 in words is "three hundred ninety-nine thousand, six hundred seventy-five".