18136949 has 4 divisors (see below), whose sum is σ = 18925536. Its totient is φ = 17348364.

The previous prime is 18136933. The next prime is 18136957. The reversal of 18136949 is 94963181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18136949 - 2⁴ = 18136933 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 (18136969) 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, 394259 + ... + 394304.

It is an arithmetic number, because the mean of its divisors is an integer number (4731384).

Almost surely, 2^18136949 is an apocalyptic number.

It is an amenable number.

18136949 is a deficient number, since it is larger than the sum of its proper divisors (788587).

18136949 is an equidigital number, since it uses as much as digits as its factorization.

18136949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788586.

The product of its digits is 46656, while the sum is 41.

The square root of 18136949 is about 4258.7496991488. The cubic root of 18136949 is about 262.7371051939.

The spelling of 18136949 in words is "eighteen million, one hundred thirty-six thousand, nine hundred forty-nine".