18261086 has 4 divisors (see below), whose sum is σ = 27391632. Its totient is φ = 9130542.

The previous prime is 18261073. The next prime is 18261137. The reversal of 18261086 is 68016281.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565270 + ... + 4565273.

It is an arithmetic number, because the mean of its divisors is an integer number (6847908).

Almost surely, 2^18261086 is an apocalyptic number.

18261086 is a deficient number, since it is larger than the sum of its proper divisors (9130546).

18261086 is an equidigital number, since it uses as much as digits as its factorization.

18261086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130545.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18261086 is about 4273.2991938314. The cubic root of 18261086 is about 263.3351709890.

It can be divided in two parts, 1826 and 1086, that multiplied together give a triangular number (1983036 = T₁₉₉₁).

The spelling of 18261086 in words is "eighteen million, two hundred sixty-one thousand, eighty-six".