18688950 has 144 divisors (see below), whose sum is σ = 60933600. Its totient is φ = 4008960.

The previous prime is 18688931. The next prime is 18688979. The reversal of 18688950 is 5988681.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 18688896 and 18688905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 53376 + ... + 53724.

It is an arithmetic number, because the mean of its divisors is an integer number (423150).

Almost surely, 2^18688950 is an apocalyptic number.

18688950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18688950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30466800).

18688950 is an abundant number, since it is smaller than the sum of its proper divisors (42244650).

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

18688950 is a wasteful number, since it uses less digits than its factorization.

18688950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 18688950 is about 4323.0718245248. The cubic root of 18688950 is about 265.3759940973.

The spelling of 18688950 in words is "eighteen million, six hundred eighty-eight thousand, nine hundred fifty".