18761345 has 8 divisors (see below), whose sum is σ = 22540776. Its totient is φ = 14990976.

The previous prime is 18761333. The next prime is 18761363. The reversal of 18761345 is 54316781.

It can be written as a sum of positive squares in 4 ways, for example, as 5424241 + 13337104 = 2329^2 + 3652^2 .

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 18761345 - 2⁸ = 18761089 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 3749 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (2817597).

Almost surely, 2^18761345 is an apocalyptic number.

It is an amenable number.

18761345 is a deficient number, since it is larger than the sum of its proper divisors (3779431).

18761345 is a wasteful number, since it uses less digits than its factorization.

18761345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531.

The product of its digits is 20160, while the sum is 35.

The square root of 18761345 is about 4331.4368285824. The cubic root of 18761345 is about 265.7182130990.

The spelling of 18761345 in words is "eighteen million, seven hundred sixty-one thousand, three hundred forty-five".