399654 has 20 divisors (see below), whose sum is σ = 895884. Its totient is φ = 133164.

The previous prime is 399647. The next prime is 399667. The reversal of 399654 is 456993.

It is a super-3 number, since 3×399654³ = 191502190853334792, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

399654 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1072 + ... + 1395.

2³⁹⁹⁶⁵⁴ is an apocalyptic number.

399654 is an abundant number, since it is smaller than the sum of its proper divisors (496230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399654 is a wasteful number, since it uses less digits than its factorization.

399654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2472 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 399654 is about 632.1819358381. The cubic root of 399654 is about 73.6593792627.

The spelling of 399654 in words is "three hundred ninety-nine thousand, six hundred fifty-four".