18440024 has 8 divisors (see below), whose sum is σ = 34575060. Its totient is φ = 9220008.

The previous prime is 18440021. The next prime is 18440029. The reversal of 18440024 is 42004481.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1152494 + ... + 1152509.

Almost surely, 2^18440024 is an apocalyptic number.

It is an amenable number.

18440024 is a deficient number, since it is larger than the sum of its proper divisors (16135036).

18440024 is a wasteful number, since it uses less digits than its factorization.

18440024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305009 (or 2305005 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18440024 is about 4294.1849051945. The cubic root of 18440024 is about 264.1925057515.

The spelling of 18440024 in words is "eighteen million, four hundred forty thousand, twenty-four".