18642745 has 8 divisors (see below), whose sum is σ = 24405120. Its totient is φ = 13558320.

The previous prime is 18642739. The next prime is 18642751. The reversal of 18642745 is 54724681.

It is an interprime number because it is at equal distance from previous prime (18642739) and next prime (18642751).

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

It is not a de Polignac number, because 18642745 - 2²³ = 10254137 is a prime.

It is a super-2 number, since 2×18642745² = 695103882270050, which contains 22 as substring.

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, 169425 + ... + 169534.

It is an arithmetic number, because the mean of its divisors is an integer number (3050640).

Almost surely, 2^18642745 is an apocalyptic number.

It is an amenable number.

18642745 is a deficient number, since it is larger than the sum of its proper divisors (5762375).

18642745 is a wasteful number, since it uses less digits than its factorization.

18642745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338975.

The product of its digits is 53760, while the sum is 37.

The square root of 18642745 is about 4317.7245164554. The cubic root of 18642745 is about 265.1571158004.

The spelling of 18642745 in words is "eighteen million, six hundred forty-two thousand, seven hundred forty-five".