18450749 has 4 divisors (see below), whose sum is σ = 18585564. Its totient is φ = 18315936.

The previous prime is 18450739. The next prime is 18450793. The reversal of 18450749 is 94705481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13741849 + 4708900 = 3707^2 + 2170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18450749 is a prime.

It is a super-2 number, since 2×18450749² = 680860277322002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18450739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67202 + ... + 67475.

It is an arithmetic number, because the mean of its divisors is an integer number (4646391).

Almost surely, 2^18450749 is an apocalyptic number.

It is an amenable number.

18450749 is a deficient number, since it is larger than the sum of its proper divisors (134815).

18450749 is a wasteful number, since it uses less digits than its factorization.

18450749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134814.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 18450749 is about 4295.4335054800. The cubic root of 18450749 is about 264.2437152921.

The spelling of 18450749 in words is "eighteen million, four hundred fifty thousand, seven hundred forty-nine".