18272461 has 4 divisors (see below), whose sum is σ = 18337312. Its totient is φ = 18207612.

The previous prime is 18272459. The next prime is 18272473. The reversal of 18272461 is 16427281.

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 not a de Polignac number, because 18272461 - 2¹ = 18272459 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 (18272431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32001 + ... + 32566.

It is an arithmetic number, because the mean of its divisors is an integer number (4584328).

Almost surely, 2^18272461 is an apocalyptic number.

It is an amenable number.

18272461 is a deficient number, since it is larger than the sum of its proper divisors (64851).

18272461 is an equidigital number, since it uses as much as digits as its factorization.

18272461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64850.

The product of its digits is 5376, while the sum is 31.

The square root of 18272461 is about 4274.6299255023. The cubic root of 18272461 is about 263.3898376140.

The spelling of 18272461 in words is "eighteen million, two hundred seventy-two thousand, four hundred sixty-one".