18898770 has 32 divisors (see below), whose sum is σ = 49481280. Its totient is φ = 4581440.

The previous prime is 18898741. The next prime is 18898771. The reversal of 18898770 is 7789881.

It is not an unprimeable number, because it can be changed into a prime (18898771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28305 + ... + 28964.

It is an arithmetic number, because the mean of its divisors is an integer number (1546290).

Almost surely, 2^18898770 is an apocalyptic number.

18898770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18898770 is an abundant number, since it is smaller than the sum of its proper divisors (30582510).

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

18898770 is a wasteful number, since it uses less digits than its factorization.

18898770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57290.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 18898770 is about 4347.2715581155. The cubic root of 18898770 is about 266.3654219746.

Subtracting from 18898770 its reverse (7789881), we obtain a square (11108889 = 3333²).

The spelling of 18898770 in words is "eighteen million, eight hundred ninety-eight thousand, seven hundred seventy".