1985708265 has 8 divisors (see below), whose sum is σ = 3177133248. Its totient is φ = 1059044400.

The previous prime is 1985708251. The next prime is 1985708287. The reversal of 1985708265 is 5628075891.

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

It is not a de Polignac number, because 1985708265 - 2⁶ = 1985708201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66190261 + ... + 66190290.

It is an arithmetic number, because the mean of its divisors is an integer number (397141656).

Almost surely, 2^1985708265 is an apocalyptic number.

1985708265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1985708265 is a deficient number, since it is larger than the sum of its proper divisors (1191424983).

1985708265 is a wasteful number, since it uses less digits than its factorization.

1985708265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132380559.

The product of its (nonzero) digits is 1209600, while the sum is 51.

The square root of 1985708265 is about 44561.2866174216. The cubic root of 1985708265 is about 1256.9127966547.

The spelling of 1985708265 in words is "one billion, nine hundred eighty-five million, seven hundred eight thousand, two hundred sixty-five".