18135945 has 24 divisors (see below), whose sum is σ = 31539456. Its totient is φ = 9640608.

The previous prime is 18135941. The next prime is 18135947. The reversal of 18135945 is 54953181.

It is not a de Polignac number, because 18135945 - 2² = 18135941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18135941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20584 + ... + 21446.

It is an arithmetic number, because the mean of its divisors is an integer number (1314144).

Almost surely, 2^18135945 is an apocalyptic number.

18135945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18135945 is a deficient number, since it is larger than the sum of its proper divisors (13403511).

18135945 is a wasteful number, since it uses less digits than its factorization.

18135945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341 (or 1338 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 18135945 is about 4258.6318225458. The cubic root of 18135945 is about 262.7322570260.

The spelling of 18135945 in words is "eighteen million, one hundred thirty-five thousand, nine hundred forty-five".