18481545 has 12 divisors (see below), whose sum is σ = 32034756. Its totient is φ = 9856800.

The previous prime is 18481543. The next prime is 18481553. The reversal of 18481545 is 54518481.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 11778624 = 2589^2 + 3432^2 .

It is not a de Polignac number, because 18481545 - 2¹ = 18481543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18481543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205306 + ... + 205395.

It is an arithmetic number, because the mean of its divisors is an integer number (2669563).

Almost surely, 2^18481545 is an apocalyptic number.

18481545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18481545 is a deficient number, since it is larger than the sum of its proper divisors (13553211).

18481545 is a wasteful number, since it uses less digits than its factorization.

18481545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410712 (or 410709 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 18481545 is about 4299.0167480483. The cubic root of 18481545 is about 264.3906492757.

The spelling of 18481545 in words is "eighteen million, four hundred eighty-one thousand, five hundred forty-five".