399727993 has 8 divisors (see below), whose sum is σ = 456996800. Its totient is φ = 342500400.

The previous prime is 399727949. The next prime is 399728033.

399727993 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 399727993 - 2⁹ = 399727481 is a prime.

It is a super-3 number, since 3×399727993³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399727093) 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, 14458 + ... + 31756.

It is an arithmetic number, because the mean of its divisors is an integer number (57124600).

Almost surely, 2^399727993 is an apocalyptic number.

It is an amenable number.

399727993 is a deficient number, since it is larger than the sum of its proper divisors (57268807).

399727993 is a wasteful number, since it uses less digits than its factorization.

399727993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20607.

The product of its digits is 5786802, while the sum is 58.

The square root of 399727993 is about 19993.1986685473. The cubic root of 399727993 is about 736.6392481304.

The spelling of 399727993 in words is "three hundred ninety-nine million, seven hundred twenty-seven thousand, nine hundred ninety-three".