205787742 has 16 divisors (see below), whose sum is σ = 411903360. Its totient is φ = 68541272.

The previous prime is 205787719. The next prime is 205787773. The reversal of 205787742 is 247787502.

It is a junction number, because it is equal to n+sod(n) for n = 205787694 and 205787703.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5088 + ... + 20915.

It is an arithmetic number, because the mean of its divisors is an integer number (25743960).

Almost surely, 2^205787742 is an apocalyptic number.

205787742 is an abundant number, since it is smaller than the sum of its proper divisors (206115618).

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

205787742 is a wasteful number, since it uses less digits than its factorization.

205787742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27327.

The product of its (nonzero) digits is 219520, while the sum is 42.

The square root of 205787742 is about 14345.3038308709. The cubic root of 205787742 is about 590.3911434857.

The spelling of 205787742 in words is "two hundred five million, seven hundred eighty-seven thousand, seven hundred forty-two".