205140154 has 8 divisors (see below), whose sum is σ = 308598048. Its totient is φ = 102274140.

The previous prime is 205140149. The next prime is 205140161. The reversal of 205140154 is 451041502.

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

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, 147102 + ... + 148489.

It is an arithmetic number, because the mean of its divisors is an integer number (38574756).

Almost surely, 2^205140154 is an apocalyptic number.

205140154 is a deficient number, since it is larger than the sum of its proper divisors (103457894).

205140154 is a wasteful number, since it uses less digits than its factorization.

205140154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295940.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 205140154 is about 14322.7146169991. The cubic root of 205140154 is about 589.7711973104.

Adding to 205140154 its reverse (451041502), we get a palindrome (656181656).

The spelling of 205140154 in words is "two hundred five million, one hundred forty thousand, one hundred fifty-four".