18098781 has 8 divisors (see below), whose sum is σ = 24540960. Its totient is φ = 11861232.

The previous prime is 18098779. The next prime is 18098783. The reversal of 18098781 is 18789081.

It is an interprime number because it is at equal distance from previous prime (18098779) and next prime (18098783).

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

It is not a de Polignac number, because 18098781 - 2¹ = 18098779 is a prime.

It is a super-2 number, since 2×18098781² = 655131747371922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50950 + ... + 51303.

It is an arithmetic number, because the mean of its divisors is an integer number (3067620).

Almost surely, 2^18098781 is an apocalyptic number.

It is an amenable number.

18098781 is a deficient number, since it is larger than the sum of its proper divisors (6442179).

18098781 is a wasteful number, since it uses less digits than its factorization.

18098781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102315.

The product of its (nonzero) digits is 32256, while the sum is 42.

The square root of 18098781 is about 4254.2662116986. The cubic root of 18098781 is about 262.5526715167.

The spelling of 18098781 in words is "eighteen million, ninety-eight thousand, seven hundred eighty-one".