18326490 has 128 divisors (see below), whose sum is σ = 55641600. Its totient is φ = 3838464.

The previous prime is 18326489. The next prime is 18326491. The reversal of 18326490 is 9462381.

It is an interprime number because it is at equal distance from previous prime (18326489) and next prime (18326491).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18326491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 133702 + ... + 133838.

It is an arithmetic number, because the mean of its divisors is an integer number (434700).

Almost surely, 2^18326490 is an apocalyptic number.

18326490 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 18326490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27820800).

18326490 is an abundant number, since it is smaller than the sum of its proper divisors (37315110).

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

18326490 is a wasteful number, since it uses less digits than its factorization.

18326490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 18326490 is about 4280.9449891350. The cubic root of 18326490 is about 263.6491839332.

The spelling of 18326490 in words is "eighteen million, three hundred twenty-six thousand, four hundred ninety".