18948870 has 32 divisors (see below), whose sum is σ = 50531040. Its totient is φ = 5052960.

The previous prime is 18948869. The next prime is 18948877. The reversal of 18948870 is 7884981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34821 + ... + 35360.

It is an arithmetic number, because the mean of its divisors is an integer number (1579095).

Almost surely, 2^18948870 is an apocalyptic number.

18948870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18948870 is an abundant number, since it is smaller than the sum of its proper divisors (31582170).

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

18948870 is a wasteful number, since it uses less digits than its factorization.

18948870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70197 (or 70191 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 18948870 is about 4353.0299792214. The cubic root of 18948870 is about 266.6005895309.

The spelling of 18948870 in words is "eighteen million, nine hundred forty-eight thousand, eight hundred seventy".