18742005 has 24 divisors (see below), whose sum is σ = 32792760. Its totient is φ = 9901440.

The previous prime is 18741979. The next prime is 18742021. The reversal of 18742005 is 50024781.

It can be written as a sum of positive squares in 4 ways, for example, as 6922161 + 11819844 = 2631^2 + 3438^2 .

It is not a de Polignac number, because 18742005 - 2¹⁵ = 18709237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18742005.

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 23 ways as a sum of consecutive naturals, for example, 2995 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (1366365).

Almost surely, 2^18742005 is an apocalyptic number.

18742005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18742005 is a deficient number, since it is larger than the sum of its proper divisors (14050755).

18742005 is a wasteful number, since it uses less digits than its factorization.

18742005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3938 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18742005 is about 4329.2037374095. The cubic root of 18742005 is about 265.6268771263.

Adding to 18742005 its reverse (50024781), we get a palindrome (68766786).

The spelling of 18742005 in words is "eighteen million, seven hundred forty-two thousand, five".