905698989 has 20 divisors (see below), whose sum is σ = 1457033116. Its totient is φ = 557352576.

The previous prime is 905698951. The next prime is 905698993. The reversal of 905698989 is 989896509.

It can be written as a sum of positive squares in 2 ways, for example, as 601475625 + 304223364 = 24525^2 + 17442^2 .

It is not a de Polignac number, because 905698989 - 2¹⁶ = 905633453 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905698999) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 429004 + ... + 431109.

Almost surely, 2^905698989 is an apocalyptic number.

It is an amenable number.

905698989 is a deficient number, since it is larger than the sum of its proper divisors (551334127).

905698989 is a wasteful number, since it uses less digits than its factorization.

905698989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860138 (or 860129 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 63.

The square root of 905698989 is about 30094.8332608772. The cubic root of 905698989 is about 967.5229920622.

The spelling of 905698989 in words is "nine hundred five million, six hundred ninety-eight thousand, nine hundred eighty-nine".