18667441 has 8 divisors (see below), whose sum is σ = 20167784. Its totient is φ = 17176320.

The previous prime is 18667433. The next prime is 18667459. The reversal of 18667441 is 14476681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2547216 + 16120225 = 1596^2 + 4015^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18667441 - 2³ = 18667433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18667441.

It is not an unprimeable number, because it can be changed into a prime (18667471) 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, 2251 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (2520973).

Almost surely, 2^18667441 is an apocalyptic number.

It is an amenable number.

18667441 is a deficient number, since it is larger than the sum of its proper divisors (1500343).

18667441 is a wasteful number, since it uses less digits than its factorization.

18667441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4611.

The product of its digits is 32256, while the sum is 37.

The square root of 18667441 is about 4320.5834096798. The cubic root of 18667441 is about 265.2741484717.

The spelling of 18667441 in words is "eighteen million, six hundred sixty-seven thousand, four hundred forty-one".