18026443890 has 800 divisors, whose sum is σ = 65593414656. Its totient is φ = 3520661760.

The previous prime is 18026443861. The next prime is 18026443907. The reversal of 18026443890 is 9834462081.

It is a happy number.

18026443890 is a `hidden beast` number, since 1 + 8 + 0 + 264 + 4 + 389 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 399 ways as a sum of consecutive naturals, for example, 581498175 + ... + 581498205.

Almost surely, 2^18026443890 is an apocalyptic number.

18026443890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18026443890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32796707328).

18026443890 is an abundant number, since it is smaller than the sum of its proper divisors (47566970766).

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

18026443890 is a wasteful number, since it uses less digits than its factorization.

18026443890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 18026443890 in words is "eighteen billion, twenty-six million, four hundred forty-three thousand, eight hundred ninety".