18449761 has 4 divisors (see below), whose sum is σ = 20127024. Its totient is φ = 16772500.

The previous prime is 18449759. The next prime is 18449797. The reversal of 18449761 is 16794481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18449761 - 2¹ = 18449759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18449701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838615 + ... + 838636.

It is an arithmetic number, because the mean of its divisors is an integer number (5031756).

Almost surely, 2^18449761 is an apocalyptic number.

18449761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18449761 is a deficient number, since it is larger than the sum of its proper divisors (1677263).

18449761 is a wasteful number, since it uses less digits than its factorization.

18449761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677262.

The product of its digits is 48384, while the sum is 40.

The square root of 18449761 is about 4295.3184980860. The cubic root of 18449761 is about 264.2389986371.

The spelling of 18449761 in words is "eighteen million, four hundred forty-nine thousand, seven hundred sixty-one".