18428642 has 8 divisors (see below), whose sum is σ = 27928236. Its totient is φ = 9119232.

The previous prime is 18428633. The next prime is 18428713. The reversal of 18428642 is 24682481.

It can be written as a sum of positive squares in 2 ways, for example, as 17131321 + 1297321 = 4139^2 + 1139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18428642² = 679229691928328, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 47303 + ... + 47690.

Almost surely, 2^18428642 is an apocalyptic number.

18428642 is a deficient number, since it is larger than the sum of its proper divisors (9499594).

18428642 is an equidigital number, since it uses as much as digits as its factorization.

18428642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95092.

The product of its digits is 24576, while the sum is 35.

The square root of 18428642 is about 4292.8594200137. The cubic root of 18428642 is about 264.1381374563.

The spelling of 18428642 in words is "eighteen million, four hundred twenty-eight thousand, six hundred forty-two".