18143461 has 8 divisors (see below), whose sum is σ = 21826880. Its totient is φ = 14732928.

The previous prime is 18143459. The next prime is 18143467. The reversal of 18143461 is 16434181.

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

It is not a de Polignac number, because 18143461 - 2¹ = 18143459 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 (18143467) 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, 68076 + ... + 68341.

It is an arithmetic number, because the mean of its divisors is an integer number (2728360).

Almost surely, 2^18143461 is an apocalyptic number.

It is an amenable number.

18143461 is a deficient number, since it is larger than the sum of its proper divisors (3683419).

18143461 is a wasteful number, since it uses less digits than its factorization.

18143461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136443.

The product of its digits is 2304, while the sum is 28.

The square root of 18143461 is about 4259.5141741753. The cubic root of 18143461 is about 262.7685463384.

The spelling of 18143461 in words is "eighteen million, one hundred forty-three thousand, four hundred sixty-one".