18366428 has 6 divisors (see below), whose sum is σ = 32141256. Its totient is φ = 9183212.

The previous prime is 18366427. The next prime is 18366431. The reversal of 18366428 is 82466381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18366391 and 18366400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18366421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2295800 + ... + 2295807.

It is an arithmetic number, because the mean of its divisors is an integer number (5356876).

Almost surely, 2^18366428 is an apocalyptic number.

It is an amenable number.

18366428 is a deficient number, since it is larger than the sum of its proper divisors (13774828).

18366428 is a wasteful number, since it uses less digits than its factorization.

18366428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591611 (or 4591609 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 18366428 is about 4285.6070748495. The cubic root of 18366428 is about 263.8405641241.

The spelling of 18366428 in words is "eighteen million, three hundred sixty-six thousand, four hundred twenty-eight".