172106389 has 48 divisors (see below), whose sum is σ = 232135680. Its totient is φ = 124843680.

The previous prime is 172106381. The next prime is 172106461. The reversal of 172106389 is 983601271.

It is not a de Polignac number, because 172106389 - 2³ = 172106381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172106381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5551804 + ... + 5551834.

It is an arithmetic number, because the mean of its divisors is an integer number (4836160).

Almost surely, 2^172106389 is an apocalyptic number.

172106389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

172106389 is a deficient number, since it is larger than the sum of its proper divisors (60029291).

172106389 is an equidigital number, since it uses as much as digits as its factorization.

172106389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 172106389 is about 13118.9324641908. The cubic root of 172106389 is about 556.2444159857.

The spelling of 172106389 in words is "one hundred seventy-two million, one hundred six thousand, three hundred eighty-nine".