205172902 has 8 divisors (see below), whose sum is σ = 335737512. Its totient is φ = 93260400.

The previous prime is 205172879. The next prime is 205172959. The reversal of 205172902 is 209271502.

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

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4662999 + ... + 4663042.

It is an arithmetic number, because the mean of its divisors is an integer number (41967189).

Almost surely, 2^205172902 is an apocalyptic number.

205172902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205172902 is a deficient number, since it is larger than the sum of its proper divisors (130564610).

205172902 is a wasteful number, since it uses less digits than its factorization.

205172902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9326054.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 205172902 is about 14323.8577904139. The cubic root of 205172902 is about 589.8025787817.

The spelling of 205172902 in words is "two hundred five million, one hundred seventy-two thousand, nine hundred two".