18899437 has 4 divisors (see below), whose sum is σ = 18912960. Its totient is φ = 18885916.

The previous prime is 18899381. The next prime is 18899449. The reversal of 18899437 is 73499881.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18899437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18899467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4387 + ... + 7552.

It is an arithmetic number, because the mean of its divisors is an integer number (4728240).

Almost surely, 2^18899437 is an apocalyptic number.

It is an amenable number.

18899437 is a deficient number, since it is larger than the sum of its proper divisors (13523).

18899437 is a wasteful number, since it uses less digits than its factorization.

18899437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13522.

The product of its digits is 435456, while the sum is 49.

The square root of 18899437 is about 4347.3482722230. The cubic root of 18899437 is about 266.3685555761.

The spelling of 18899437 in words is "eighteen million, eight hundred ninety-nine thousand, four hundred thirty-seven".