172193978 has 16 divisors (see below), whose sum is σ = 286549920. Its totient is φ = 76942800.

The previous prime is 172193977. The next prime is 172193981. The reversal of 172193978 is 879391271.

172193978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172193977) 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, 65033 + ... + 67628.

It is an arithmetic number, because the mean of its divisors is an integer number (17909370).

Almost surely, 2^172193978 is an apocalyptic number.

172193978 is a deficient number, since it is larger than the sum of its proper divisors (114355942).

172193978 is a wasteful number, since it uses less digits than its factorization.

172193978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132733.

The product of its digits is 190512, while the sum is 47.

The square root of 172193978 is about 13122.2703066200. The cubic root of 172193978 is about 556.3387619494.

The spelling of 172193978 in words is "one hundred seventy-two million, one hundred ninety-three thousand, nine hundred seventy-eight".