18621005 has 8 divisors (see below), whose sum is σ = 24064152. Its totient is φ = 13750848.

The previous prime is 18620999. The next prime is 18621013. The reversal of 18621005 is 50012681.

It can be written as a sum of positive squares in 4 ways, for example, as 1990921 + 16630084 = 1411^2 + 4078^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18621005 - 2⁴ = 18620989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143174 + ... + 143303.

It is an arithmetic number, because the mean of its divisors is an integer number (3008019).

Almost surely, 2^18621005 is an apocalyptic number.

It is an amenable number.

18621005 is a deficient number, since it is larger than the sum of its proper divisors (5443147).

18621005 is a wasteful number, since it uses less digits than its factorization.

18621005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286495.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18621005 is about 4315.2062523129. The cubic root of 18621005 is about 265.0540058437.

Adding to 18621005 its reverse (50012681), we get a palindrome (68633686).

The spelling of 18621005 in words is "eighteen million, six hundred twenty-one thousand, five".