1985701965 has 32 divisors (see below), whose sum is σ = 3423665280. Its totient is φ = 976962816.

The previous prime is 1985701957. The next prime is 1985701967. The reversal of 1985701965 is 5691075891.

It is not a de Polignac number, because 1985701965 - 2³ = 1985701957 is a prime.

It is a super-2 number, since 2×1985701965² = 7886024587609722450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985701967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 587019 + ... + 590391.

It is an arithmetic number, because the mean of its divisors is an integer number (106989540).

Almost surely, 2^1985701965 is an apocalyptic number.

1985701965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1985701965 is a deficient number, since it is larger than the sum of its proper divisors (1437963315).

1985701965 is a wasteful number, since it uses less digits than its factorization.

1985701965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6413.

The product of its (nonzero) digits is 680400, while the sum is 51.

The square root of 1985701965 is about 44561.2159282038. The cubic root of 1985701965 is about 1256.9114673962.

The spelling of 1985701965 in words is "one billion, nine hundred eighty-five million, seven hundred one thousand, nine hundred sixty-five".