989720943 has 8 divisors (see below), whose sum is σ = 1397253168. Its totient is φ = 621001344.

The previous prime is 989720939. The next prime is 989720947. The reversal of 989720943 is 349027989.

It is an interprime number because it is at equal distance from previous prime (989720939) and next prime (989720947).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 989720943 - 2² = 989720939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 19406293 = 989720943 / (9 + 8 + 9 + 7 + 2 + 0 + 9 + 4 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989720947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9703096 + ... + 9703197.

It is an arithmetic number, because the mean of its divisors is an integer number (174656646).

Almost surely, 2^989720943 is an apocalyptic number.

989720943 is a deficient number, since it is larger than the sum of its proper divisors (407532225).

989720943 is a wasteful number, since it uses less digits than its factorization.

989720943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19406313.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 989720943 is about 31459.8306257361. The cubic root of 989720943 is about 996.5618402718.

The spelling of 989720943 in words is "nine hundred eighty-nine million, seven hundred twenty thousand, nine hundred forty-three".