1002798889 has 3 divisors (see below), whose sum is σ = 1002830557. Its totient is φ = 1002767222.

The previous prime is 1002798871. The next prime is 1002798899. The reversal of 1002798889 is 9888972001.

The square root of 1002798889 is 31667.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9888972001 = 541 ⋅18279061.

It is not a de Polignac number, because 1002798889 - 2²⁵ = 969244457 is a prime.

It is a super-2 number, since 2×1002798889² = 2011211223559268642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002798899) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 15834 + ... + 47500.

Almost surely, 2^1002798889 is an apocalyptic number.

1002798889 is the 31667-th square number.

1002798889 is the 15834-th centered octagonal number.

It is an amenable number.

1002798889 is a deficient number, since it is larger than the sum of its proper divisors (31668).

1002798889 is an frugal number, since it uses more digits than its factorization.

1002798889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63334 (or 31667 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 52.

The cubic root of 1002798889 is about 1000.9320939310.

The spelling of 1002798889 in words is "one billion, two million, seven hundred ninety-eight thousand, eight hundred eighty-nine".