399662841849 has 4 divisors (see below), whose sum is σ = 532883789136. Its totient is φ = 266441894564.

The previous prime is 399662841833. The next prime is 399662841889. The reversal of 399662841849 is 948148266993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399662841849 - 2⁴ = 399662841833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399662841889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66610473639 + ... + 66610473644.

It is an arithmetic number, because the mean of its divisors is an integer number (133220947284).

Almost surely, 2^399662841849 is an apocalyptic number.

It is an amenable number.

399662841849 is a deficient number, since it is larger than the sum of its proper divisors (133220947287).

399662841849 is a wasteful number, since it uses less digits than its factorization.

399662841849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133220947286.

The product of its digits is 161243136, while the sum is 69.

The spelling of 399662841849 in words is "three hundred ninety-nine billion, six hundred sixty-two million, eight hundred forty-one thousand, eight hundred forty-nine".