889809869 has 16 divisors (see below), whose sum is σ = 1015944048. Its totient is φ = 772042752.

The previous prime is 889809863. The next prime is 889809913. The reversal of 889809869 is 968908988.

It can be written as a sum of positive squares in 8 ways, for example, as 81090025 + 808719844 = 9005^2 + 28438^2 .

It is not a de Polignac number, because 889809869 - 2¹⁶ = 889744333 is a prime.

It is a super-2 number, since 2×889809869² = 1583523205939594322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (889809863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204929 + ... + 209225.

It is an arithmetic number, because the mean of its divisors is an integer number (63496503).

Almost surely, 2^889809869 is an apocalyptic number.

It is an amenable number.

889809869 is a deficient number, since it is larger than the sum of its proper divisors (126134179).

889809869 is a wasteful number, since it uses less digits than its factorization.

889809869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264.

The product of its (nonzero) digits is 17915904, while the sum is 65.

The square root of 889809869 is about 29829.6810073457. The cubic root of 889809869 is about 961.8316697101.

The spelling of 889809869 in words is "eight hundred eighty-nine million, eight hundred nine thousand, eight hundred sixty-nine".