18223776 has 36 divisors (see below), whose sum is σ = 51824682. Its totient is φ = 6074496.

The previous prime is 18223771. The next prime is 18223781. The reversal of 18223776 is 67732281.

It is an interprime number because it is at equal distance from previous prime (18223771) and next prime (18223781).

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 76176 = 4260^2 + 276^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 18223776.

It is not an unprimeable number, because it can be changed into a prime (18223771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31351 + ... + 31926.

Almost surely, 2^18223776 is an apocalyptic number.

18223776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18223776 is an abundant number, since it is smaller than the sum of its proper divisors (33600906).

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

18223776 is a wasteful number, since it uses less digits than its factorization.

18223776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63293 (or 63282 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 18223776 is about 4268.9314822330. The cubic root of 18223776 is about 263.1557049530.

The spelling of 18223776 in words is "eighteen million, two hundred twenty-three thousand, seven hundred seventy-six".