399922 has 4 divisors (see below), whose sum is σ = 599886. Its totient is φ = 199960.

The previous prime is 399913. The next prime is 399937. The reversal of 399922 is 229993.

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., 239121 + 160801 = 489^2 + 401^2 .

It is an unprimeable number.

399922 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 as a sum of consecutive naturals, namely, 99979 + ... + 99982.

2³⁹⁹⁹²² is an apocalyptic number.

399922 is a deficient number, since it is larger than the sum of its proper divisors (199964).

399922 is a wasteful number, since it uses less digits than its factorization.

399922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199963.

The product of its digits is 8748, while the sum is 34.

The square root of 399922 is about 632.3938646129. The cubic root of 399922 is about 73.6758404205.

It can be divided in two parts, 3999 and 22, that multiplied together give a palindrome (87978).

The spelling of 399922 in words is "three hundred ninety-nine thousand, nine hundred twenty-two".