18501849 has 24 divisors (see below), whose sum is σ = 27623232. Its totient is φ = 11927520.

The previous prime is 18501841. The next prime is 18501851. The reversal of 18501849 is 94810581.

It is not a de Polignac number, because 18501849 - 2³ = 18501841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18501841) 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 23 ways as a sum of consecutive naturals, for example, 36532 + ... + 37034.

It is an arithmetic number, because the mean of its divisors is an integer number (1150968).

Almost surely, 2^18501849 is an apocalyptic number.

It is an amenable number.

18501849 is a deficient number, since it is larger than the sum of its proper divisors (9121383).

18501849 is a wasteful number, since it uses less digits than its factorization.

18501849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 18501849 is about 4301.3775700350. The cubic root of 18501849 is about 264.4874345299.

The spelling of 18501849 in words is "eighteen million, five hundred one thousand, eight hundred forty-nine".