18889730 has 32 divisors (see below), whose sum is σ = 35866800. Its totient is φ = 7151872.

The previous prime is 18889729. The next prime is 18889733. The reversal of 18889730 is 3798881.

It can be written as a sum of positive squares in 8 ways, for example, as 16104169 + 2785561 = 4013^2 + 1669^2 .

It is not an unprimeable number, because it can be changed into a prime (18889733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14756 + ... + 15984.

Almost surely, 2^18889730 is an apocalyptic number.

18889730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18889730 is a deficient number, since it is larger than the sum of its proper divisors (16977070).

18889730 is a wasteful number, since it uses less digits than its factorization.

18889730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18889730 is about 4346.2317011407. The cubic root of 18889730 is about 266.3229442991.

The spelling of 18889730 in words is "eighteen million, eight hundred eighty-nine thousand, seven hundred thirty".