18450937 has 4 divisors (see below), whose sum is σ = 18467316. Its totient is φ = 18434560.

The previous prime is 18450907. The next prime is 18450947. The reversal of 18450937 is 73905481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73905481 = 13 ⋅5685037.

It can be written as a sum of positive squares in 2 ways, for example, as 8185321 + 10265616 = 2861^2 + 3204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18450937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18450896 and 18450905.

It is not an unprimeable number, because it can be changed into a prime (18450907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6364 + ... + 8797.

It is an arithmetic number, because the mean of its divisors is an integer number (4616829).

Almost surely, 2^18450937 is an apocalyptic number.

It is an amenable number.

18450937 is a deficient number, since it is larger than the sum of its proper divisors (16379).

18450937 is a wasteful number, since it uses less digits than its factorization.

18450937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16378.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 18450937 is about 4295.4553891293. The cubic root of 18450937 is about 264.2446127741.

The spelling of 18450937 in words is "eighteen million, four hundred fifty thousand, nine hundred thirty-seven".