18861010 has 32 divisors (see below), whose sum is σ = 39341952. Its totient is φ = 6376320.

The previous prime is 18860999. The next prime is 18861019. The reversal of 18861010 is 1016881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18861019) 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, 3265 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (1229436).

Almost surely, 2^18861010 is an apocalyptic number.

18861010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18861010 is an abundant number, since it is smaller than the sum of its proper divisors (20480942).

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

18861010 is a wasteful number, since it uses less digits than its factorization.

18861010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 18861010 is about 4342.9264327179. The cubic root of 18861010 is about 266.1879031127.

Adding to 18861010 its reverse (1016881), we get a palindrome (19877891).

The spelling of 18861010 in words is "eighteen million, eight hundred sixty-one thousand, ten".