399873280126 has 4 divisors (see below), whose sum is σ = 599809920192. Its totient is φ = 199936640062.

The previous prime is 399873280123. The next prime is 399873280151. The reversal of 399873280126 is 621082378993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 621082378993 = 109 ⋅5698003477.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399873280123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99968320030 + ... + 99968320033.

It is an arithmetic number, because the mean of its divisors is an integer number (149952480048).

Almost surely, 2^399873280126 is an apocalyptic number.

399873280126 is a deficient number, since it is larger than the sum of its proper divisors (199936640066).

399873280126 is a wasteful number, since it uses less digits than its factorization.

399873280126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199936640065.

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 399873280126 in words is "three hundred ninety-nine billion, eight hundred seventy-three million, two hundred eighty thousand, one hundred twenty-six".