299921993 has 24 divisors (see below), whose sum is σ = 367893504. Its totient is φ = 243432000.

The previous prime is 299921989. The next prime is 299922017. The reversal of 299921993 is 399129992.

It is not a de Polignac number, because 299921993 - 2² = 299921989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (299921903) 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, 69293 + ... + 73493.

It is an arithmetic number, because the mean of its divisors is an integer number (15328896).

Almost surely, 2^299921993 is an apocalyptic number.

It is an amenable number.

299921993 is a deficient number, since it is larger than the sum of its proper divisors (67971511).

299921993 is a wasteful number, since it uses less digits than its factorization.

299921993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293 (or 4286 counting only the distinct ones).

The product of its digits is 708588, while the sum is 53.

The square root of 299921993 is about 17318.2560611627. The cubic root of 299921993 is about 669.3749223233.

The spelling of 299921993 in words is "two hundred ninety-nine million, nine hundred twenty-one thousand, nine hundred ninety-three".