18222491 has 8 divisors (see below), whose sum is σ = 21333984. Its totient is φ = 15238080.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222491 is 19422281.

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 18222491 - 2⁶ = 18222427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18222431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31460 + ... + 32033.

It is an arithmetic number, because the mean of its divisors is an integer number (2666748).

Almost surely, 2^18222491 is an apocalyptic number.

18222491 is a deficient number, since it is larger than the sum of its proper divisors (3111493).

18222491 is an equidigital number, since it uses as much as digits as its factorization.

18222491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63541.

The product of its digits is 2304, while the sum is 29.

The square root of 18222491 is about 4268.7809735333. The cubic root of 18222491 is about 263.1495195714.

The spelling of 18222491 in words is "eighteen million, two hundred twenty-two thousand, four hundred ninety-one".