172347997 has 8 divisors (see below), whose sum is σ = 178481880. Its totient is φ = 166320960.

The previous prime is 172347991. The next prime is 172348009. The reversal of 172347997 is 799743271.

172347997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1758276 + 170589721 = 1326^2 + 13061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172347997 - 2⁷ = 172347869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172347997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172347991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23422 + ... + 29887.

It is an arithmetic number, because the mean of its divisors is an integer number (22310235).

Almost surely, 2^172347997 is an apocalyptic number.

It is an amenable number.

172347997 is a deficient number, since it is larger than the sum of its proper divisors (6133883).

172347997 is an equidigital number, since it uses as much as digits as its factorization.

172347997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53423.

The product of its digits is 666792, while the sum is 49.

The square root of 172347997 is about 13128.1376059211. The cubic root of 172347997 is about 556.5045850248.

The spelling of 172347997 in words is "one hundred seventy-two million, three hundred forty-seven thousand, nine hundred ninety-seven".