18161247 has 24 divisors (see below), whose sum is σ = 26536464. Its totient is φ = 11042304.

The previous prime is 18161197. The next prime is 18161261. The reversal of 18161247 is 74216181.

It is not a de Polignac number, because 18161247 - 2⁶ = 18161183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18161947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57133 + ... + 57449.

It is an arithmetic number, because the mean of its divisors is an integer number (1105686).

Almost surely, 2^18161247 is an apocalyptic number.

18161247 is a deficient number, since it is larger than the sum of its proper divisors (8375217).

18161247 is a wasteful number, since it uses less digits than its factorization.

18161247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 446 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 18161247 is about 4261.6014595455. The cubic root of 18161247 is about 262.8543821302.

The spelling of 18161247 in words is "eighteen million, one hundred sixty-one thousand, two hundred forty-seven".