172978223 has 16 divisors (see below), whose sum is σ = 201450240. Its totient is φ = 146865600.

The previous prime is 172978217. The next prime is 172978231. The reversal of 172978223 is 322879271.

It is a cyclic number.

It is not a de Polignac number, because 172978223 - 2⁸ = 172977967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172972223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9011 + ... + 20667.

It is an arithmetic number, because the mean of its divisors is an integer number (12590640).

Almost surely, 2^172978223 is an apocalyptic number.

172978223 is a deficient number, since it is larger than the sum of its proper divisors (28472017).

172978223 is a wasteful number, since it uses less digits than its factorization.

172978223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11758.

The product of its digits is 84672, while the sum is 41.

The square root of 172978223 is about 13152.1185745871. The cubic root of 172978223 is about 557.1820844895.

The spelling of 172978223 in words is "one hundred seventy-two million, nine hundred seventy-eight thousand, two hundred twenty-three".