18724749 has 16 divisors (see below), whose sum is σ = 26032320. Its totient is φ = 11957120.

The previous prime is 18724733. The next prime is 18724777. The reversal of 18724749 is 94742781.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18724749 - 2⁴ = 18724733 is a prime.

It is a super-2 number, since 2×18724749² = 701232450226002, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18724749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18724649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11134 + ... + 12704.

It is an arithmetic number, because the mean of its divisors is an integer number (1627020).

Almost surely, 2^18724749 is an apocalyptic number.

It is an amenable number.

18724749 is a deficient number, since it is larger than the sum of its proper divisors (7307571).

18724749 is a wasteful number, since it uses less digits than its factorization.

18724749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740.

The product of its digits is 112896, while the sum is 42.

The square root of 18724749 is about 4327.2103022617. The cubic root of 18724749 is about 265.5453300905.

The spelling of 18724749 in words is "eighteen million, seven hundred twenty-four thousand, seven hundred forty-nine".