1021939889 has 8 divisors (see below), whose sum is σ = 1053560640. Its totient is φ = 990529776.

The previous prime is 1021939873. The next prime is 1021939901. The reversal of 1021939889 is 9889391201.

It is a happy number.

1021939889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1021939889 - 2⁴ = 1021939873 is a prime.

It is a super-2 number, since 2×1021939889² = 2088722273458664642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021939829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42779 + ... + 62240.

It is an arithmetic number, because the mean of its divisors is an integer number (131695080).

Almost surely, 2^1021939889 is an apocalyptic number.

It is an amenable number.

1021939889 is a deficient number, since it is larger than the sum of its proper divisors (31620751).

1021939889 is a wasteful number, since it uses less digits than its factorization.

1021939889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105319.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 1021939889 is about 31967.7945595251. The cubic root of 1021939889 is about 1007.2604545566.

The spelling of 1021939889 in words is "one billion, twenty-one million, nine hundred thirty-nine thousand, eight hundred eighty-nine".