18500049 has 16 divisors (see below), whose sum is σ = 27494400. Its totient is φ = 12294288.

The previous prime is 18500047. The next prime is 18500051. The reversal of 18500049 is 94000581.

It is an interprime number because it is at equal distance from previous prime (18500047) and next prime (18500051).

It is not a de Polignac number, because 18500049 - 2¹ = 18500047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18499995 and 18500031.

It is not an unprimeable number, because it can be changed into a prime (18500047) 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, 9447 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (1718400).

Almost surely, 2^18500049 is an apocalyptic number.

It is an amenable number.

18500049 is a deficient number, since it is larger than the sum of its proper divisors (8994351).

18500049 is a wasteful number, since it uses less digits than its factorization.

18500049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2175 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18500049 is about 4301.1683296518. The cubic root of 18500049 is about 264.4788571382.

The spelling of 18500049 in words is "eighteen million, five hundred thousand, forty-nine".