181797987 has 24 divisors (see below), whose sum is σ = 284733696. Its totient is φ = 102867408.

The previous prime is 181797953. The next prime is 181797989. The reversal of 181797987 is 789797181.

It is not a de Polignac number, because 181797987 - 2⁶ = 181797923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181797989) 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, 9138 + ... + 21144.

It is an arithmetic number, because the mean of its divisors is an integer number (11863904).

Almost surely, 2^181797987 is an apocalyptic number.

181797987 is a deficient number, since it is larger than the sum of its proper divisors (102935709).

181797987 is a wasteful number, since it uses less digits than its factorization.

181797987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127 (or 12120 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 57.

The square root of 181797987 is about 13483.2483845696. The cubic root of 181797987 is about 566.4953595597.

The spelling of 181797987 in words is "one hundred eighty-one million, seven hundred ninety-seven thousand, nine hundred eighty-seven".