1985264457 has 32 divisors (see below), whose sum is σ = 3049712640. Its totient is φ = 1136088000.

The previous prime is 1985264447. The next prime is 1985264473. The reversal of 1985264457 is 7544625891.

It is not a de Polignac number, because 1985264457 - 2⁸ = 1985264201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985264417) 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, 189907 + ... + 200087.

It is an arithmetic number, because the mean of its divisors is an integer number (95303520).

Almost surely, 2^1985264457 is an apocalyptic number.

It is an amenable number.

1985264457 is a deficient number, since it is larger than the sum of its proper divisors (1064448183).

1985264457 is a wasteful number, since it uses less digits than its factorization.

1985264457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10525.

The product of its digits is 2419200, while the sum is 51.

The square root of 1985264457 is about 44556.3065906500. The cubic root of 1985264457 is about 1256.8191492095.

The spelling of 1985264457 in words is "one billion, nine hundred eighty-five million, two hundred sixty-four thousand, four hundred fifty-seven".