205140534 has 16 divisors (see below), whose sum is σ = 410780160. Its totient is φ = 68297000.

The previous prime is 205140517. The next prime is 205140541. The reversal of 205140534 is 435041502.

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 7 ways as a sum of consecutive naturals, for example, 15342 + ... + 25409.

It is an arithmetic number, because the mean of its divisors is an integer number (25673760).

Almost surely, 2^205140534 is an apocalyptic number.

205140534 is an abundant number, since it is smaller than the sum of its proper divisors (205639626).

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

205140534 is a wasteful number, since it uses less digits than its factorization.

205140534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41595.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 205140534 is about 14322.7278826346. The cubic root of 205140534 is about 589.7715614727.

The spelling of 205140534 in words is "two hundred five million, one hundred forty thousand, five hundred thirty-four".