1964317985 has 32 divisors (see below), whose sum is σ = 2728207872. Its totient is φ = 1329914880.

The previous prime is 1964317981. The next prime is 1964318003. The reversal of 1964317985 is 5897134691.

It is not a de Polignac number, because 1964317985 - 2² = 1964317981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964317981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1229207 + ... + 1230803.

It is an arithmetic number, because the mean of its divisors is an integer number (85256496).

Almost surely, 2^1964317985 is an apocalyptic number.

It is an amenable number.

1964317985 is a deficient number, since it is larger than the sum of its proper divisors (763889887).

1964317985 is a wasteful number, since it uses less digits than its factorization.

1964317985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its digits is 1632960, while the sum is 53.

The square root of 1964317985 is about 44320.6270826576. The cubic root of 1964317985 is about 1252.3832898556.

The spelling of 1964317985 in words is "one billion, nine hundred sixty-four million, three hundred seventeen thousand, nine hundred eighty-five".