18861545 has 8 divisors (see below), whose sum is σ = 22773696. Its totient is φ = 14996016.

The previous prime is 18861539. The next prime is 18861569. The reversal of 18861545 is 54516881.

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 18861545 - 2⁴ = 18861529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18861499 and 18861508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10757 + ... + 12386.

It is an arithmetic number, because the mean of its divisors is an integer number (2846712).

Almost surely, 2^18861545 is an apocalyptic number.

It is an amenable number.

18861545 is a deficient number, since it is larger than the sum of its proper divisors (3912151).

18861545 is a wasteful number, since it uses less digits than its factorization.

18861545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23311.

The product of its digits is 38400, while the sum is 38.

The square root of 18861545 is about 4342.9880266931. The cubic root of 18861545 is about 266.1904199305.

The spelling of 18861545 in words is "eighteen million, eight hundred sixty-one thousand, five hundred forty-five".