18689480 has 16 divisors (see below), whose sum is σ = 42051420. Its totient is φ = 7475776.

The previous prime is 18689441. The next prime is 18689491. The reversal of 18689480 is 8498681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 2896804 = 3974^2 + 1702^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233579 + ... + 233658.

Almost surely, 2^18689480 is an apocalyptic number.

18689480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18689480 is an abundant number, since it is smaller than the sum of its proper divisors (23361940).

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

18689480 is a wasteful number, since it uses less digits than its factorization.

18689480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467248 (or 467244 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18689480 is about 4323.1331230949. The cubic root of 18689480 is about 265.3785026732.

The spelling of 18689480 in words is "eighteen million, six hundred eighty-nine thousand, four hundred eighty".