18191010 has 32 divisors (see below), whose sum is σ = 44066880. Its totient is φ = 4805568.

The previous prime is 18190979. The next prime is 18191023. The reversal of 18191010 is 1019181.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489 + ... + 6051.

It is an arithmetic number, because the mean of its divisors is an integer number (1377090).

Almost surely, 2^18191010 is an apocalyptic number.

18191010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18191010 is an abundant number, since it is smaller than the sum of its proper divisors (25875870).

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

18191010 is a wasteful number, since it uses less digits than its factorization.

18191010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5682.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 18191010 is about 4265.0920271431. The cubic root of 18191010 is about 262.9978940301.

The spelling of 18191010 in words is "eighteen million, one hundred ninety-one thousand, ten".