18428040 has 128 divisors (see below), whose sum is σ = 62380800. Its totient is φ = 4838400.

The previous prime is 18428009. The next prime is 18428057. The reversal of 18428040 is 4082481.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18427995 and 18428013.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121965 + ... + 122115.

It is an arithmetic number, because the mean of its divisors is an integer number (487350).

Almost surely, 2^18428040 is an apocalyptic number.

18428040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18428040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31190400).

18428040 is an abundant number, since it is smaller than the sum of its proper divisors (43952760).

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

18428040 is a wasteful number, since it uses less digits than its factorization.

18428040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 18428040 is about 4292.7893030057. The cubic root of 18428040 is about 264.1352612651.

It can be divided in two parts, 184 and 28040, that added together give a square (28224 = 168²).

The spelling of 18428040 in words is "eighteen million, four hundred twenty-eight thousand, forty".