18672440 has 64 divisors (see below), whose sum is σ = 44928000. Its totient is φ = 6963840.

The previous prime is 18672419. The next prime is 18672461. The reversal of 18672440 is 4427681.

It is an interprime number because it is at equal distance from previous prime (18672419) and next prime (18672461).

It is a junction number, because it is equal to n+sod(n) for n = 18672397 and 18672406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59885 + ... + 60195.

It is an arithmetic number, because the mean of its divisors is an integer number (702000).

Almost surely, 2^18672440 is an apocalyptic number.

18672440 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 18672440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22464000).

18672440 is an abundant number, since it is smaller than the sum of its proper divisors (26255560).

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

18672440 is a wasteful number, since it uses less digits than its factorization.

18672440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 18672440 is about 4321.1618807909. The cubic root of 18672440 is about 265.2978258308.

The spelling of 18672440 in words is "eighteen million, six hundred seventy-two thousand, four hundred forty".