989025421 has 4 divisors (see below), whose sum is σ = 1007686332. Its totient is φ = 970364512.

The previous prime is 989025419. The next prime is 989025481. The reversal of 989025421 is 124520989.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 364275396 + 624750025 = 19086^2 + 24995^2 .

It is a cyclic number.

It is not a de Polignac number, because 989025421 - 2¹ = 989025419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989025481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9330376 + ... + 9330481.

It is an arithmetic number, because the mean of its divisors is an integer number (251921583).

Almost surely, 2^989025421 is an apocalyptic number.

It is an amenable number.

989025421 is a deficient number, since it is larger than the sum of its proper divisors (18660911).

989025421 is a wasteful number, since it uses less digits than its factorization.

989025421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18660910.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 989025421 is about 31448.7745548217. The cubic root of 989025421 is about 996.3283424300.

The spelling of 989025421 in words is "nine hundred eighty-nine million, twenty-five thousand, four hundred twenty-one".