18011953 has 4 divisors (see below), whose sum is σ = 18024448. Its totient is φ = 17999460.

The previous prime is 18011941. The next prime is 18011977. The reversal of 18011953 is 35911081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35911081 = 157 ⋅228733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18011953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18011153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3753 + ... + 7078.

It is an arithmetic number, because the mean of its divisors is an integer number (4506112).

Almost surely, 2^18011953 is an apocalyptic number.

It is an amenable number.

18011953 is a deficient number, since it is larger than the sum of its proper divisors (12495).

18011953 is a wasteful number, since it uses less digits than its factorization.

18011953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12494.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18011953 is about 4244.0491278966. The cubic root of 18011953 is about 262.1321371810.

The spelling of 18011953 in words is "eighteen million, eleven thousand, nine hundred fifty-three".