12291993 has 60 divisors (see below), whose sum is σ = 22622160. Its totient is φ = 6613488.

The previous prime is 12291991. The next prime is 12291997. The reversal of 12291993 is 39919221.

It is a happy number.

It is not a de Polignac number, because 12291993 - 2¹ = 12291991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12291991) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 75330 + ... + 75492.

It is an arithmetic number, because the mean of its divisors is an integer number (377036).

Almost surely, 2^12291993 is an apocalyptic number.

It is an amenable number.

12291993 is a deficient number, since it is larger than the sum of its proper divisors (10330167).

12291993 is a wasteful number, since it uses less digits than its factorization.

12291993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 192 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 12291993 is about 3505.9938676501. The cubic root of 12291993 is about 230.7849237790.

The spelling of 12291993 in words is "twelve million, two hundred ninety-one thousand, nine hundred ninety-three".