399446071973 has 4 divisors (see below), whose sum is σ = 430172692908. Its totient is φ = 368719451040.

The previous prime is 399446071943. The next prime is 399446071979. The reversal of 399446071973 is 379170644993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 160346587489 + 239099484484 = 400433^2 + 488978^2 .

It is a cyclic number.

It is not a de Polignac number, because 399446071973 - 2³⁰ = 398372330149 is a prime.

It is a super-2 number, since 2×399446071973² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399446071979) 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 in 3 ways as a sum of consecutive naturals, for example, 15363310448 + ... + 15363310473.

It is an arithmetic number, because the mean of its divisors is an integer number (107543173227).

Almost surely, 2^399446071973 is an apocalyptic number.

It is an amenable number.

399446071973 is a deficient number, since it is larger than the sum of its proper divisors (30726620935).

399446071973 is a wasteful number, since it uses less digits than its factorization.

399446071973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30726620934.

The product of its (nonzero) digits is 30862944, while the sum is 62.

The spelling of 399446071973 in words is "three hundred ninety-nine billion, four hundred forty-six million, seventy-one thousand, nine hundred seventy-three".