172089738 has 32 divisors (see below), whose sum is σ = 392761920. Its totient is φ = 55812240.

The previous prime is 172089727. The next prime is 172089763. The reversal of 172089738 is 837980271.

It is a super-2 number, since 2×172089738² = 59229755849817288, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 172089693 and 172089702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41068 + ... + 45063.

It is an arithmetic number, because the mean of its divisors is an integer number (12273810).

Almost surely, 2^172089738 is an apocalyptic number.

172089738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172089738 is an abundant number, since it is smaller than the sum of its proper divisors (220672182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172089738 is a wasteful number, since it uses less digits than its factorization.

172089738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86179 (or 86173 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 172089738 is about 13118.2978316548. The cubic root of 172089738 is about 556.2264768405.

The spelling of 172089738 in words is "one hundred seventy-two million, eighty-nine thousand, seven hundred thirty-eight".