187172997 has 16 divisors (see below), whose sum is σ = 272635392. Its totient is φ = 113278320.

The previous prime is 187172987. The next prime is 187173029. The reversal of 187172997 is 799271781.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-187172997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187172917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22368 + ... + 29574.

It is an arithmetic number, because the mean of its divisors is an integer number (17039712).

Almost surely, 2^187172997 is an apocalyptic number.

It is an amenable number.

187172997 is a deficient number, since it is larger than the sum of its proper divisors (85462395).

187172997 is a wasteful number, since it uses less digits than its factorization.

187172997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008.

The product of its digits is 444528, while the sum is 51.

The square root of 187172997 is about 13681.1182656974. The cubic root of 187172997 is about 572.0241943325.

The spelling of 187172997 in words is "one hundred eighty-seven million, one hundred seventy-two thousand, nine hundred ninety-seven".