18229738 has 8 divisors (see below), whose sum is σ = 27393732. Its totient is φ = 9098496.

The previous prime is 18229727. The next prime is 18229751. The reversal of 18229738 is 83792281.

It can be written as a sum of positive squares in 2 ways, for example, as 14493249 + 3736489 = 3807^2 + 1933^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18229738.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6745 + ... + 9052.

Almost surely, 2^18229738 is an apocalyptic number.

18229738 is a deficient number, since it is larger than the sum of its proper divisors (9163994).

18229738 is a wasteful number, since it uses less digits than its factorization.

18229738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376.

The product of its digits is 48384, while the sum is 40.

The square root of 18229738 is about 4269.6297263346. The cubic root of 18229738 is about 263.1843993950.

The spelling of 18229738 in words is "eighteen million, two hundred twenty-nine thousand, seven hundred thirty-eight".