399967947 has 6 divisors (see below), whose sum is σ = 577731492. Its totient is φ = 266645292.

The previous prime is 399967937. The next prime is 399967951. The reversal of 399967947 is 749769993.

It is not a de Polignac number, because 399967947 - 2¹⁰ = 399966923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399967927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22220433 + ... + 22220450.

It is an arithmetic number, because the mean of its divisors is an integer number (96288582).

Almost surely, 2^399967947 is an apocalyptic number.

399967947 is a deficient number, since it is larger than the sum of its proper divisors (177763545).

399967947 is a wasteful number, since it uses less digits than its factorization.

399967947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44440889 (or 44440886 counting only the distinct ones).

The product of its digits is 23147208, while the sum is 63.

The square root of 399967947 is about 19999.1986589463. The cubic root of 399967947 is about 736.7866184921.

The spelling of 399967947 in words is "three hundred ninety-nine million, nine hundred sixty-seven thousand, nine hundred forty-seven".