18621037 has 4 divisors (see below), whose sum is σ = 18703296. Its totient is φ = 18538780.

The previous prime is 18621023. The next prime is 18621047. The reversal of 18621037 is 73012681.

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-18621037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18620996 and 18621014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18621017) 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, 40789 + ... + 41242.

It is an arithmetic number, because the mean of its divisors is an integer number (4675824).

Almost surely, 2^18621037 is an apocalyptic number.

It is an amenable number.

18621037 is a deficient number, since it is larger than the sum of its proper divisors (82259).

18621037 is an equidigital number, since it uses as much as digits as its factorization.

18621037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82258.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18621037 is about 4315.2099601294. The cubic root of 18621037 is about 265.0541576744.

It can be divided in two parts, 18 and 621037, that added together give a triangular number (621055 = T₁₁₁₄).

The spelling of 18621037 in words is "eighteen million, six hundred twenty-one thousand, thirty-seven".