172142885 has 8 divisors (see below), whose sum is σ = 208617336. Its totient is φ = 136350400.

The previous prime is 172142881. The next prime is 172142891. The reversal of 172142885 is 588241271.

It can be written as a sum of positive squares in 4 ways, for example, as 38925121 + 133217764 = 6239^2 + 11542^2 .

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

It is not a de Polignac number, because 172142885 - 2² = 172142881 is a prime.

It is a super-2 number, since 2×172142885² = 59266345712246450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172142881) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 169934 + ... + 170943.

It is an arithmetic number, because the mean of its divisors is an integer number (26077167).

Almost surely, 2^172142885 is an apocalyptic number.

It is an amenable number.

172142885 is a deficient number, since it is larger than the sum of its proper divisors (36474451).

172142885 is a wasteful number, since it uses less digits than its factorization.

172142885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340983.

The product of its digits is 35840, while the sum is 38.

The square root of 172142885 is about 13120.3233572957. The cubic root of 172142885 is about 556.2837313215.

The spelling of 172142885 in words is "one hundred seventy-two million, one hundred forty-two thousand, eight hundred eighty-five".