989694721 has 4 divisors (see below), whose sum is σ = 1004466352. Its totient is φ = 974923092.

The previous prime is 989694709. The next prime is 989694731. The reversal of 989694721 is 127496989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 989694721 - 2¹¹ = 989692673 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989694731) 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, 7385715 + ... + 7385848.

It is an arithmetic number, because the mean of its divisors is an integer number (251116588).

Almost surely, 2^989694721 is an apocalyptic number.

It is an amenable number.

989694721 is a deficient number, since it is larger than the sum of its proper divisors (14771631).

989694721 is a wasteful number, since it uses less digits than its factorization.

989694721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14771630.

The product of its digits is 1959552, while the sum is 55.

The square root of 989694721 is about 31459.4138693015. The cubic root of 989694721 is about 996.5530391124.

The spelling of 989694721 in words is "nine hundred eighty-nine million, six hundred ninety-four thousand, seven hundred twenty-one".