18489690 has 24 divisors (see below), whose sum is σ = 48073428. Its totient is φ = 4930560.

The previous prime is 18489673. The next prime is 18489703. The reversal of 18489690 is 9698481.

It can be written as a sum of positive squares in 2 ways, for example, as 14814801 + 3674889 = 3849^2 + 1917^2 .

It is a super-2 number, since 2×18489690² = 683737272592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102631 + ... + 102810.

Almost surely, 2^18489690 is an apocalyptic number.

18489690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18489690 is an abundant number, since it is smaller than the sum of its proper divisors (29583738).

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

18489690 is a wasteful number, since it uses less digits than its factorization.

18489690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205454 (or 205451 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18489690 is about 4299.9639533373. The cubic root of 18489690 is about 264.4294834310.

It can be divided in two parts, 1848 and 9690, that multiplied together give a triangular number (17907120 = T₅₉₈₄).

The spelling of 18489690 in words is "eighteen million, four hundred eighty-nine thousand, six hundred ninety".