18743121 has 6 divisors (see below), whose sum is σ = 27073410. Its totient is φ = 12495408.

The previous prime is 18743119. The next prime is 18743147. The reversal of 18743121 is 12134781.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 1404225 = 4164^2 + 1185^2 .

It is not a de Polignac number, because 18743121 - 2¹ = 18743119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18743521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1041276 + ... + 1041293.

It is an arithmetic number, because the mean of its divisors is an integer number (4512235).

Almost surely, 2^18743121 is an apocalyptic number.

It is an amenable number.

18743121 is a deficient number, since it is larger than the sum of its proper divisors (8330289).

18743121 is a wasteful number, since it uses less digits than its factorization.

18743121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082575 (or 2082572 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18743121 is about 4329.3326275536. The cubic root of 18743121 is about 265.6321493070.

The spelling of 18743121 in words is "eighteen million, seven hundred forty-three thousand, one hundred twenty-one".