18984745 has 16 divisors (see below), whose sum is σ = 24876432. Its totient is φ = 13824000.

The previous prime is 18984739. The next prime is 18984751. The reversal of 18984745 is 54748981.

It is an interprime number because it is at equal distance from previous prime (18984739) and next prime (18984751).

It can be written as a sum of positive squares in 8 ways, for example, as 4756761 + 14227984 = 2181^2 + 3772^2 .

It is not a de Polignac number, because 18984745 - 2⁹ = 18984233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18984695 and 18984704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2745 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (1554777).

Almost surely, 2^18984745 is an apocalyptic number.

It is an amenable number.

18984745 is a deficient number, since it is larger than the sum of its proper divisors (5891687).

18984745 is a wasteful number, since it uses less digits than its factorization.

18984745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092.

The product of its digits is 322560, while the sum is 46.

The square root of 18984745 is about 4357.1487236494. The cubic root of 18984745 is about 266.7687308961.

The spelling of 18984745 in words is "eighteen million, nine hundred eighty-four thousand, seven hundred forty-five".