399645546993 has 24 divisors (see below), whose sum is σ = 719707999296. Its totient is φ = 207608076000.

The previous prime is 399645546977. The next prime is 399645547019.

It is a happy number.

399645546993 is a `hidden beast` number, since 3 + 9 + 9 + 6 + 4 + 554 + 69 + 9 + 3 = 666.

399645546993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399645546993 - 2⁴ = 399645546977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399645546493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288343858 + ... + 288345243.

It is an arithmetic number, because the mean of its divisors is an integer number (29987833304).

Almost surely, 2^399645546993 is an apocalyptic number.

399645546993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

399645546993 is a deficient number, since it is larger than the sum of its proper divisors (320062452303).

399645546993 is a wasteful number, since it uses less digits than its factorization.

399645546993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576689125 (or 576689122 counting only the distinct ones).

The product of its digits is 850305600, while the sum is 72.

The spelling of 399645546993 in words is "three hundred ninety-nine billion, six hundred forty-five million, five hundred forty-six thousand, nine hundred ninety-three".