172312789 has 8 divisors (see below), whose sum is σ = 188110368. Its totient is φ = 156537360.

The previous prime is 172312741. The next prime is 172312793. The reversal of 172312789 is 987213271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172312789 - 2¹⁷ = 172181717 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 (172312489) 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, 13639 + ... + 23035.

It is an arithmetic number, because the mean of its divisors is an integer number (23513796).

Almost surely, 2^172312789 is an apocalyptic number.

It is an amenable number.

172312789 is a deficient number, since it is larger than the sum of its proper divisors (15797579).

172312789 is a wasteful number, since it uses less digits than its factorization.

172312789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075.

The product of its digits is 42336, while the sum is 40.

The square root of 172312789 is about 13126.7966008467. The cubic root of 172312789 is about 556.4666873833.

The spelling of 172312789 in words is "one hundred seventy-two million, three hundred twelve thousand, seven hundred eighty-nine".