17121872 has 20 divisors (see below), whose sum is σ = 33325620. Its totient is φ = 8521728.

The previous prime is 17121857. The next prime is 17121877. The reversal of 17121872 is 27812171.

It can be written as a sum of positive squares in 2 ways, for example, as 16192576 + 929296 = 4024^2 + 964^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17121877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328 + ... + 6000.

It is an arithmetic number, because the mean of its divisors is an integer number (1666281).

Almost surely, 2^17121872 is an apocalyptic number.

It is an amenable number.

17121872 is a deficient number, since it is larger than the sum of its proper divisors (16203748).

17121872 is a wasteful number, since it uses less digits than its factorization.

17121872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910 (or 4904 counting only the distinct ones).

The product of its digits is 1568, while the sum is 29.

The square root of 17121872 is about 4137.8583832703. The cubic root of 17121872 is about 257.7411421270.

The spelling of 17121872 in words is "seventeen million, one hundred twenty-one thousand, eight hundred seventy-two".