1021905849 has 8 divisors (see below), whose sum is σ = 1399366720. Its totient is φ = 662857776.

The previous prime is 1021905839. The next prime is 1021905869. The reversal of 1021905849 is 9485091201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021905849 - 2⁵ = 1021905817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021905839) 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 7 ways as a sum of consecutive naturals, for example, 4603069 + ... + 4603290.

It is an arithmetic number, because the mean of its divisors is an integer number (174920840).

Almost surely, 2^1021905849 is an apocalyptic number.

It is an amenable number.

1021905849 is a deficient number, since it is larger than the sum of its proper divisors (377460871).

1021905849 is an equidigital number, since it uses as much as digits as its factorization.

1021905849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9206399.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1021905849 is about 31967.2621442625. The cubic root of 1021905849 is about 1007.2492707525.

The spelling of 1021905849 in words is "one billion, twenty-one million, nine hundred five thousand, eight hundred forty-nine".