1021857745 has 16 divisors (see below), whose sum is σ = 1233840960. Its totient is φ = 812430144.

The previous prime is 1021857721. The next prime is 1021857751. The reversal of 1021857745 is 5477581201.

It is a cyclic number.

It is not a de Polignac number, because 1021857745 - 2⁵ = 1021857713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021857698 and 1021857707.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 646366 + ... + 647944.

It is an arithmetic number, because the mean of its divisors is an integer number (77115060).

Almost surely, 2^1021857745 is an apocalyptic number.

It is an amenable number.

1021857745 is a deficient number, since it is larger than the sum of its proper divisors (211983215).

1021857745 is a wasteful number, since it uses less digits than its factorization.

1021857745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 1021857745 is about 31966.5097406645. The cubic root of 1021857745 is about 1007.2334658134.

The spelling of 1021857745 in words is "one billion, twenty-one million, eight hundred fifty-seven thousand, seven hundred forty-five".