399626993 has 8 divisors (see below), whose sum is σ = 409197888. Its totient is φ = 390068784.

The previous prime is 399626977. The next prime is 399627017.

399626993 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 399626993 - 2⁴ = 399626977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399626093) 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 7 ways as a sum of consecutive naturals, for example, 99380 + ... + 103322.

It is an arithmetic number, because the mean of its divisors is an integer number (51149736).

Almost surely, 2^399626993 is an apocalyptic number.

It is an amenable number.

399626993 is a deficient number, since it is larger than the sum of its proper divisors (9570895).

399626993 is a wasteful number, since it uses less digits than its factorization.

399626993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6343.

The product of its digits is 4251528, while the sum is 56.

The square root of 399626993 is about 19990.6726500136. The cubic root of 399626993 is about 736.5772002440.

The spelling of 399626993 in words is "three hundred ninety-nine million, six hundred twenty-six thousand, nine hundred ninety-three".