18303428 has 36 divisors (see below), whose sum is σ = 37928940. Its totient is φ = 7677120.

The previous prime is 18303427. The next prime is 18303449. The reversal of 18303428 is 82430381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9351364 + 8952064 = 3058^2 + 2992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18303428.

It is not an unprimeable number, because it can be changed into a prime (18303421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4838 + ... + 7746.

Almost surely, 2^18303428 is an apocalyptic number.

It is an amenable number.

18303428 is an abundant number, since it is smaller than the sum of its proper divisors (19625512).

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

18303428 is a wasteful number, since it uses less digits than its factorization.

18303428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2948 (or 2935 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 18303428 is about 4278.2505770467. The cubic root of 18303428 is about 263.5385457307.

The spelling of 18303428 in words is "eighteen million, three hundred three thousand, four hundred twenty-eight".