18428500 has 24 divisors (see below), whose sum is σ = 40248936. Its totient is φ = 7371200.

The previous prime is 18428483. The next prime is 18428507. The reversal of 18428500 is 582481.

It can be written as a sum of positive squares in 4 ways, for example, as 467856 + 17960644 = 684^2 + 4238^2 .

It is a super-2 number, since 2×18428500² = 679219224500000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17929 + ... + 18928.

It is an arithmetic number, because the mean of its divisors is an integer number (1677039).

Almost surely, 2^18428500 is an apocalyptic number.

18428500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18428500 is an abundant number, since it is smaller than the sum of its proper divisors (21820436).

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

18428500 is a wasteful number, since it uses less digits than its factorization.

18428500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36876 (or 36864 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18428500 is about 4292.8428808891. The cubic root of 18428500 is about 264.1374590248.

The spelling of 18428500 in words is "eighteen million, four hundred twenty-eight thousand, five hundred".