18612224 has 38 divisors (see below), whose sum is σ = 37748664. Its totient is φ = 9175040.

The previous prime is 18612211. The next prime is 18612227. The reversal of 18612224 is 42221681.

18612224 = T₃₀₇ + T₃₀₈ + ... + T₅₁₉.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18612193 and 18612202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18612227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262109 + ... + 262179.

Almost surely, 2^18612224 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 18612224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18874332).

18612224 is an abundant number, since it is smaller than the sum of its proper divisors (19136440).

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

18612224 is an frugal number, since it uses more digits than its factorization.

18612224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 73 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 18612224 is about 4314.1886838663. The cubic root of 18612224 is about 265.0123359631.

The spelling of 18612224 in words is "eighteen million, six hundred twelve thousand, two hundred twenty-four".