18037949 has 4 divisors (see below), whose sum is σ = 18046464. Its totient is φ = 18029436.

The previous prime is 18037933. The next prime is 18037951. The reversal of 18037949 is 94973081.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94973081 = 7 ⋅13567583.

It is a cyclic number.

It is not a de Polignac number, because 18037949 - 2⁴ = 18037933 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 (18037919) 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, 1694 + ... + 6240.

It is an arithmetic number, because the mean of its divisors is an integer number (4511616).

Almost surely, 2^18037949 is an apocalyptic number.

It is an amenable number.

18037949 is a deficient number, since it is larger than the sum of its proper divisors (8515).

18037949 is an equidigital number, since it uses as much as digits as its factorization.

18037949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8514.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18037949 is about 4247.1106649109. The cubic root of 18037949 is about 262.2581851697.

The spelling of 18037949 in words is "eighteen million, thirty-seven thousand, nine hundred forty-nine".