172988927 has 4 divisors (see below), whose sum is σ = 174772416. Its totient is φ = 171205440.

The previous prime is 172988899. The next prime is 172988929. The reversal of 172988927 is 729889271.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172988927 - 2⁸ = 172988671 is a prime.

It is a super-2 number, since 2×172988927² = 59850337729222658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172988929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 891599 + ... + 891792.

It is an arithmetic number, because the mean of its divisors is an integer number (43693104).

Almost surely, 2^172988927 is an apocalyptic number.

172988927 is a deficient number, since it is larger than the sum of its proper divisors (1783489).

172988927 is an equidigital number, since it uses as much as digits as its factorization.

172988927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783488.

The product of its digits is 1016064, while the sum is 53.

The square root of 172988927 is about 13152.5254989299. The cubic root of 172988927 is about 557.1935771771.

The spelling of 172988927 in words is "one hundred seventy-two million, nine hundred eighty-eight thousand, nine hundred twenty-seven".