399866547 has 8 divisors (see below), whose sum is σ = 536426944. Its totient is φ = 264941928.

The previous prime is 399866513. The next prime is 399866549. The reversal of 399866547 is 745668993.

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 399866547 - 2¹⁰ = 399865523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399866549) 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 7 ways as a sum of consecutive naturals, for example, 408373 + ... + 409350.

It is an arithmetic number, because the mean of its divisors is an integer number (67053368).

Almost surely, 2^399866547 is an apocalyptic number.

399866547 is a deficient number, since it is larger than the sum of its proper divisors (136560397).

399866547 is a wasteful number, since it uses less digits than its factorization.

399866547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817889.

The product of its digits is 9797760, while the sum is 57.

The square root of 399866547 is about 19996.6633966770. The cubic root of 399866547 is about 736.7243497711.

The spelling of 399866547 in words is "three hundred ninety-nine million, eight hundred sixty-six thousand, five hundred forty-seven".