18231005 has 16 divisors (see below), whose sum is σ = 23801904. Its totient is φ = 13324800.

The previous prime is 18230969. The next prime is 18231029. The reversal of 18231005 is 50013281.

It can be written as a sum of positive squares in 8 ways, for example, as 481636 + 17749369 = 694^2 + 4213^2 .

It is not a de Polignac number, because 18231005 - 2¹⁴ = 18214621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5177 + ... + 7953.

It is an arithmetic number, because the mean of its divisors is an integer number (1487619).

Almost surely, 2^18231005 is an apocalyptic number.

It is an amenable number.

18231005 is a deficient number, since it is larger than the sum of its proper divisors (5570899).

18231005 is a wasteful number, since it uses less digits than its factorization.

18231005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 18231005 is about 4269.7780972786. The cubic root of 18231005 is about 263.1904965188.

Adding to 18231005 its reverse (50013281), we get a palindrome (68244286).

The spelling of 18231005 in words is "eighteen million, two hundred thirty-one thousand, five".