18672247 has 4 divisors (see below), whose sum is σ = 20369736. Its totient is φ = 16974760.

The previous prime is 18672221. The next prime is 18672253. The reversal of 18672247 is 74227681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74227681 = 11 ⋅6747971.

It is not a de Polignac number, because 18672247 - 2¹⁵ = 18639479 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 (18672257) 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, 848728 + ... + 848749.

It is an arithmetic number, because the mean of its divisors is an integer number (5092434).

Almost surely, 2^18672247 is an apocalyptic number.

18672247 is a deficient number, since it is larger than the sum of its proper divisors (1697489).

18672247 is a wasteful number, since it uses less digits than its factorization.

18672247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697488.

The product of its digits is 37632, while the sum is 37.

The square root of 18672247 is about 4321.1395487765. The cubic root of 18672247 is about 265.2969117803.

It can be divided in two parts, 1867 and 2247, that added together give a palindrome (4114).

The spelling of 18672247 in words is "eighteen million, six hundred seventy-two thousand, two hundred forty-seven".