18249869 has 8 divisors (see below), whose sum is σ = 20161920. Its totient is φ = 16380000.

The previous prime is 18249841. The next prime is 18249877. The reversal of 18249869 is 96894281.

18249869 = 493² + 494² + ... + 558².

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 18249869 - 2¹⁶ = 18184333 is a prime.

It is a super-2 number, since 2×18249869² = 666115437034322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240869) 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, 9632 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (2520240).

Almost surely, 2^18249869 is an apocalyptic number.

It is an amenable number.

18249869 is a deficient number, since it is larger than the sum of its proper divisors (1912051).

18249869 is a wasteful number, since it uses less digits than its factorization.

18249869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21091.

The product of its digits is 248832, while the sum is 47.

The square root of 18249869 is about 4271.9865402410. The cubic root of 18249869 is about 263.2812414541.

The spelling of 18249869 in words is "eighteen million, two hundred forty-nine thousand, eight hundred sixty-nine".