1023657985 has 32 divisors (see below), whose sum is σ = 1417720320. Its totient is φ = 695058432.

The previous prime is 1023657977. The next prime is 1023657997. The reversal of 1023657985 is 5897563201.

It is a cyclic number.

It is not a de Polignac number, because 1023657985 - 2³ = 1023657977 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 2851236 + ... + 2851594.

It is an arithmetic number, because the mean of its divisors is an integer number (44303760).

Almost surely, 2^1023657985 is an apocalyptic number.

It is an amenable number.

1023657985 is a deficient number, since it is larger than the sum of its proper divisors (394062335).

1023657985 is a wasteful number, since it uses less digits than its factorization.

1023657985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 1023657985 is about 31994.6555693291. The cubic root of 1023657985 is about 1007.8246107801.

The spelling of 1023657985 in words is "one billion, twenty-three million, six hundred fifty-seven thousand, nine hundred eighty-five".