18456428 has 12 divisors (see below), whose sum is σ = 32513712. Its totient is φ = 9166800.

The previous prime is 18456421. The next prime is 18456457. The reversal of 18456428 is 82465481.

18456428 = T₄₁₇ + T₄₁₈ + ... + T₅₆₇.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18456391 and 18456400.

It is not an unprimeable number, because it can be changed into a prime (18456421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14675 + ... + 15882.

It is an arithmetic number, because the mean of its divisors is an integer number (2709476).

Almost surely, 2^18456428 is an apocalyptic number.

It is an amenable number.

18456428 is a deficient number, since it is larger than the sum of its proper divisors (14057284).

18456428 is a wasteful number, since it uses less digits than its factorization.

18456428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30712 (or 30710 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 18456428 is about 4296.0945054782. The cubic root of 18456428 is about 264.2708232453.

The spelling of 18456428 in words is "eighteen million, four hundred fifty-six thousand, four hundred twenty-eight".