399544126 has 4 divisors (see below), whose sum is σ = 599316192. Its totient is φ = 199772062.

The previous prime is 399544121. The next prime is 399544127. The reversal of 399544126 is 621445993.

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

It is a super-2 number, since 2×399544126² = 319271017242207752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399544121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99886030 + ... + 99886033.

It is an arithmetic number, because the mean of its divisors is an integer number (149829048).

Almost surely, 2^399544126 is an apocalyptic number.

399544126 is a deficient number, since it is larger than the sum of its proper divisors (199772066).

399544126 is a wasteful number, since it uses less digits than its factorization.

399544126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199772065.

The product of its digits is 233280, while the sum is 43.

The square root of 399544126 is about 19988.5999009435. The cubic root of 399544126 is about 736.5262842954.

The spelling of 399544126 in words is "three hundred ninety-nine million, five hundred forty-four thousand, one hundred twenty-six".