18648091 has 16 divisors (see below), whose sum is σ = 23385600. Its totient is φ = 14446080.

The previous prime is 18648089. The next prime is 18648107. The reversal of 18648091 is 19084681.

It is a happy number.

It is not a de Polignac number, because 18648091 - 2¹ = 18648089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18648091.

It is not an unprimeable number, because it can be changed into a prime (18648061) 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, 14715 + ... + 15931.

It is an arithmetic number, because the mean of its divisors is an integer number (1461600).

Almost surely, 2^18648091 is an apocalyptic number.

18648091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18648091 is a deficient number, since it is larger than the sum of its proper divisors (4737509).

18648091 is a wasteful number, since it uses less digits than its factorization.

18648091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18648091 is about 4318.3435481675. The cubic root of 18648091 is about 265.1824588935.

The spelling of 18648091 in words is "eighteen million, six hundred forty-eight thousand, ninety-one".