18535949 has 4 divisors (see below), whose sum is σ = 18545436. Its totient is φ = 18526464.

The previous prime is 18535943. The next prime is 18535961. The reversal of 18535949 is 94953581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18003049 + 532900 = 4243^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18535949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18535943) 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, 614 + ... + 6119.

It is an arithmetic number, because the mean of its divisors is an integer number (4636359).

Almost surely, 2^18535949 is an apocalyptic number.

It is an amenable number.

18535949 is a deficient number, since it is larger than the sum of its proper divisors (9487).

18535949 is an equidigital number, since it uses as much as digits as its factorization.

18535949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486.

The product of its digits is 194400, while the sum is 44.

The square root of 18535949 is about 4305.3395917163. The cubic root of 18535949 is about 264.6498234587.

The spelling of 18535949 in words is "eighteen million, five hundred thirty-five thousand, nine hundred forty-nine".