18742716 has 18 divisors (see below), whose sum is σ = 47377512. Its totient is φ = 6247560.

The previous prime is 18742681. The next prime is 18742727. The reversal of 18742716 is 61724781.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 520631 = 18742716 / (1 + 8 + 7 + 4 + 2 + 7 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 260280 + ... + 260351.

It is an arithmetic number, because the mean of its divisors is an integer number (2632084).

Almost surely, 2^18742716 is an apocalyptic number.

It is an amenable number.

18742716 is an abundant number, since it is smaller than the sum of its proper divisors (28634796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18742716 is a wasteful number, since it uses less digits than its factorization.

18742716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520641 (or 520636 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 18742716 is about 4329.2858533481. The cubic root of 18742716 is about 265.6302360398.

The spelling of 18742716 in words is "eighteen million, seven hundred forty-two thousand, seven hundred sixteen".