18746840 has 128 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 5913600.

The previous prime is 18746831. The next prime is 18746867. The reversal of 18746840 is 4864781.

It is a junction number, because it is equal to n+sod(n) for n = 18746794 and 18746803.

It is a congruent number.

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, 264005 + ... + 264075.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^18746840 is an apocalyptic number.

18746840 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 18746840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

18746840 is an abundant number, since it is smaller than the sum of its proper divisors (33507880).

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

18746840 is a wasteful number, since it uses less digits than its factorization.

18746840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 18746840 is about 4329.7621181769. The cubic root of 18746840 is about 265.6497170079.

The spelling of 18746840 in words is "eighteen million, seven hundred forty-six thousand, eight hundred forty".