18865098 has 72 divisors (see below), whose sum is σ = 48363588. Its totient is φ = 5298048.

The previous prime is 18865097. The next prime is 18865103. The reversal of 18865098 is 89056881.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 1750329 = 4137^2 + 1323^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18865097) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 64240 + ... + 64532.

Almost surely, 2^18865098 is an apocalyptic number.

18865098 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18865098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24181794).

18865098 is an abundant number, since it is smaller than the sum of its proper divisors (29498490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18865098 is a wasteful number, since it uses less digits than its factorization.

18865098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18865098 is about 4343.3970576036. The cubic root of 18865098 is about 266.2071332164.

The spelling of 18865098 in words is "eighteen million, eight hundred sixty-five thousand, ninety-eight".