18916870 has 16 divisors (see below), whose sum is σ = 38914848. Its totient is φ = 6485760.

The previous prime is 18916811. The next prime is 18916871. The reversal of 18916870 is 7861981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18916871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135051 + ... + 135190.

It is an arithmetic number, because the mean of its divisors is an integer number (2432178).

Almost surely, 2^18916870 is an apocalyptic number.

18916870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18916870 is an abundant number, since it is smaller than the sum of its proper divisors (19997978).

18916870 is a wasteful number, since it uses less digits than its factorization.

18916870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270255.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18916870 is about 4349.3528254213. The cubic root of 18916870 is about 266.4504306075.

The spelling of 18916870 in words is "eighteen million, nine hundred sixteen thousand, eight hundred seventy".