18261007 has 4 divisors (see below), whose sum is σ = 18400536. Its totient is φ = 18121480.

The previous prime is 18260989. The next prime is 18261013. The reversal of 18261007 is 70016281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18261007 - 2¹¹ = 18258959 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 (18261037) 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, 69568 + ... + 69829.

It is an arithmetic number, because the mean of its divisors is an integer number (4600134).

Almost surely, 2^18261007 is an apocalyptic number.

18261007 is a deficient number, since it is larger than the sum of its proper divisors (139529).

18261007 is a wasteful number, since it uses less digits than its factorization.

18261007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139528.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 18261007 is about 4273.2899503778. The cubic root of 18261007 is about 263.3347912469.

Adding to 18261007 its reverse (70016281), we get a palindrome (88277288).

The spelling of 18261007 in words is "eighteen million, two hundred sixty-one thousand, seven".