18037890 has 96 divisors (see below), whose sum is σ = 52468416. Its totient is φ = 4432320.

The previous prime is 18037889. The next prime is 18037919. The reversal of 18037890 is 9873081.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31305 + ... + 31875.

It is an arithmetic number, because the mean of its divisors is an integer number (546546).

Almost surely, 2^18037890 is an apocalyptic number.

18037890 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 18037890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26234208).

18037890 is an abundant number, since it is smaller than the sum of its proper divisors (34430526).

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

18037890 is a wasteful number, since it uses less digits than its factorization.

18037890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 18037890 is about 4247.1037190066. The cubic root of 18037890 is about 262.2578992308.

The spelling of 18037890 in words is "eighteen million, thirty-seven thousand, eight hundred ninety".