399243577947 has 8 divisors (see below), whose sum is σ = 532341613056. Its totient is φ = 266153964072.

The previous prime is 399243577937. The next prime is 399243577951. The reversal of 399243577947 is 749775342993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399243577947 - 2¹² = 399243573851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399243577937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1993843 + ... + 2184924.

It is an arithmetic number, because the mean of its divisors is an integer number (66542701632).

Almost surely, 2^399243577947 is an apocalyptic number.

399243577947 is a deficient number, since it is larger than the sum of its proper divisors (133098035109).

399243577947 is a wasteful number, since it uses less digits than its factorization.

399243577947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210617.

The product of its digits is 360067680, while the sum is 69.

The spelling of 399243577947 in words is "three hundred ninety-nine billion, two hundred forty-three million, five hundred seventy-seven thousand, nine hundred forty-seven".