18476640 has 384 divisors, whose sum is σ = 81285120. Its totient is φ = 3815424.

The previous prime is 18476597. The next prime is 18476641. The reversal of 18476640 is 4667481.

18476640 is a `hidden beast` number, since 1 + 8 + 4 + 7 + 6 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18476595 and 18476604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18476641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 393097 + ... + 393143.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

Almost surely, 2^18476640 is an apocalyptic number.

18476640 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 18476640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

18476640 is an abundant number, since it is smaller than the sum of its proper divisors (62808480).

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

18476640 is a wasteful number, since it uses less digits than its factorization.

18476640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 18476640 is about 4298.4462309072. The cubic root of 18476640 is about 264.3672574565.

The spelling of 18476640 in words is "eighteen million, four hundred seventy-six thousand, six hundred forty".