18109650 has 96 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 4320000.

The previous prime is 18109639. The next prime is 18109661. The reversal of 18109650 is 5690181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18109639) and next prime (18109661).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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, 72025 + ... + 72275.

It is an arithmetic number, because the mean of its divisors is an integer number (519498).

Almost surely, 2^18109650 is an apocalyptic number.

18109650 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 18109650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935904).

18109650 is an abundant number, since it is smaller than the sum of its proper divisors (31762158).

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

18109650 is a wasteful number, since it uses less digits than its factorization.

18109650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18109650 is about 4255.5434435569. The cubic root of 18109650 is about 262.6052185903.

The spelling of 18109650 in words is "eighteen million, one hundred nine thousand, six hundred fifty".