989878741 has 4 divisors (see below), whose sum is σ = 989953900. Its totient is φ = 989803584.

The previous prime is 989878699. The next prime is 989878751. The reversal of 989878741 is 147878989.

It is a happy 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.

It can be written as a sum of positive squares in 2 ways, for example, as 887444100 + 102434641 = 29790^2 + 10121^2 .

It is a cyclic number.

It is not a de Polignac number, because 989878741 - 2¹⁵ = 989845973 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989878741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989878751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12036 + ... + 46093.

It is an arithmetic number, because the mean of its divisors is an integer number (247488475).

Almost surely, 2^989878741 is an apocalyptic number.

It is an amenable number.

989878741 is a deficient number, since it is larger than the sum of its proper divisors (75159).

989878741 is a wasteful number, since it uses less digits than its factorization.

989878741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75158.

The product of its digits is 8128512, while the sum is 61.

The square root of 989878741 is about 31462.3384540946. The cubic root of 989878741 is about 996.6148003543.

The spelling of 989878741 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, seven hundred forty-one".