399860844769 has 4 divisors (see below), whose sum is σ = 400127598000. Its totient is φ = 399594091540.

The previous prime is 399860844767. The next prime is 399860844827. The reversal of 399860844769 is 967448068993.

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 399860844769 - 2¹ = 399860844767 is a prime.

It is a super-2 number, since 2×399860844769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399860844763) 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, 133374367 + ... + 133377364.

It is an arithmetic number, because the mean of its divisors is an integer number (100031899500).

Almost surely, 2^399860844769 is an apocalyptic number.

It is an amenable number.

399860844769 is a deficient number, since it is larger than the sum of its proper divisors (266753231).

399860844769 is a wasteful number, since it uses less digits than its factorization.

399860844769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266753230.

The product of its (nonzero) digits is 564350976, while the sum is 73.

The spelling of 399860844769 in words is "three hundred ninety-nine billion, eight hundred sixty million, eight hundred forty-four thousand, seven hundred sixty-nine".