1021789438 has 16 divisors (see below), whose sum is σ = 1576214640. Its totient is φ = 496565056.

The previous prime is 1021789423. The next prime is 1021789487. The reversal of 1021789438 is 8349871201.

It is a junction number, because it is equal to n+sod(n) for n = 1021789394 and 1021789403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33703 + ... + 56386.

It is an arithmetic number, because the mean of its divisors is an integer number (98513415).

Almost surely, 2^1021789438 is an apocalyptic number.

1021789438 is a deficient number, since it is larger than the sum of its proper divisors (554425202).

1021789438 is a wasteful number, since it uses less digits than its factorization.

1021789438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90251.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1021789438 is about 31965.4413077624. The cubic root of 1021789438 is about 1007.2110221710.

The spelling of 1021789438 in words is "one billion, twenty-one million, seven hundred eighty-nine thousand, four hundred thirty-eight".