18440441887 has 8 divisors (see below), whose sum is σ = 22183990400. Its totient is φ = 14974193304.

The previous prime is 18440441879. The next prime is 18440441891. The reversal of 18440441887 is 78814404481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18440441887 - 2³ = 18440441879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18440441887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440441837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69324837 + ... + 69325102.

It is an arithmetic number, because the mean of its divisors is an integer number (2772998800).

Almost surely, 2^18440441887 is an apocalyptic number.

18440441887 is a deficient number, since it is larger than the sum of its proper divisors (3743548513).

18440441887 is a wasteful number, since it uses less digits than its factorization.

18440441887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138649965.

The product of its (nonzero) digits is 917504, while the sum is 49.

The spelling of 18440441887 in words is "eighteen billion, four hundred forty million, four hundred forty-one thousand, eight hundred eighty-seven".