18227916 has 168 divisors, whose sum is σ = 58759680. Its totient is φ = 4828896.

The previous prime is 18227887. The next prime is 18227933. The reversal of 18227916 is 61972281.

18227916 = T₃₄₃ + T₃₄₄ + ... + T₅₃₀.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 387805 + ... + 387851.

It is an arithmetic number, because the mean of its divisors is an integer number (349760).

Almost surely, 2^18227916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18227916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29379840).

18227916 is an abundant number, since it is smaller than the sum of its proper divisors (40531764).

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

18227916 is a wasteful number, since it uses less digits than its factorization.

18227916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 78 counting only the distinct ones).

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

The square root of 18227916 is about 4269.4163535547. The cubic root of 18227916 is about 263.1756309758.

The spelling of 18227916 in words is "eighteen million, two hundred twenty-seven thousand, nine hundred sixteen".