8172397 has 4 divisors (see below), whose sum is σ = 8179996. Its totient is φ = 8164800.

The previous prime is 8172391. The next prime is 8172419. The reversal of 8172397 is 7932718.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7150276 + 1022121 = 2674^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172397 - 2³ = 8172389 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8172391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1854 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (2044999).

Almost surely, 2^8172397 is an apocalyptic number.

It is an amenable number.

8172397 is a deficient number, since it is larger than the sum of its proper divisors (7599).

8172397 is a wasteful number, since it uses less digits than its factorization.

8172397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7598.

The product of its digits is 21168, while the sum is 37.

The square root of 8172397 is about 2858.7404569145. The cubic root of 8172397 is about 201.4264437705.

The spelling of 8172397 in words is "eight million, one hundred seventy-two thousand, three hundred ninety-seven".