399554 has 4 divisors (see below), whose sum is σ = 599334. Its totient is φ = 199776.

The previous prime is 399541. The next prime is 399557. The reversal of 399554 is 455993.

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

It can be written as a sum of positive squares in only one way, i.e., 273529 + 126025 = 523^2 + 355^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99887 + ... + 99890.

2³⁹⁹⁵⁵⁴ is an apocalyptic number.

399554 is a deficient number, since it is larger than the sum of its proper divisors (199780).

399554 is a wasteful number, since it uses less digits than its factorization.

399554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199779.

The product of its digits is 24300, while the sum is 35.

The square root of 399554 is about 632.1028397342. The cubic root of 399554 is about 73.6532351544.

The spelling of 399554 in words is "three hundred ninety-nine thousand, five hundred fifty-four".