18361749 has 16 divisors (see below), whose sum is σ = 28039808. Its totient is φ = 10469952.

The previous prime is 18361747. The next prime is 18361753. The reversal of 18361749 is 94716381.

It is not a de Polignac number, because 18361749 - 2¹ = 18361747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18361747) 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, 17919 + ... + 18915.

It is an arithmetic number, because the mean of its divisors is an integer number (1752488).

Almost surely, 2^18361749 is an apocalyptic number.

It is an amenable number.

18361749 is a deficient number, since it is larger than the sum of its proper divisors (9678059).

18361749 is an equidigital number, since it uses as much as digits as its factorization.

18361749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its digits is 36288, while the sum is 39.

The square root of 18361749 is about 4285.0611430877. The cubic root of 18361749 is about 263.8181570298.

It can be divided in two parts, 18361 and 749, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18361749 in words is "eighteen million, three hundred sixty-one thousand, seven hundred forty-nine".