172969856 has 16 divisors (see below), whose sum is σ = 344588640. Its totient is φ = 86484864.

The previous prime is 172969837. The next prime is 172969859. The reversal of 172969856 is 658969271.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 172969798 and 172969807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172969859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675536 + ... + 675791.

It is an arithmetic number, because the mean of its divisors is an integer number (21536790).

Almost surely, 2^172969856 is an apocalyptic number.

172969856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172969856 is a deficient number, since it is larger than the sum of its proper divisors (171618784).

172969856 is an equidigital number, since it uses as much as digits as its factorization.

172969856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351341 (or 1351329 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 172969856 is about 13151.8004851047. The cubic root of 172969856 is about 557.1731006656.

The spelling of 172969856 in words is "one hundred seventy-two million, nine hundred sixty-nine thousand, eight hundred fifty-six".