986389021 has 2 divisors, whose sum is σ = 986389022. Its totient is φ = 986389020.

The previous prime is 986388973. The next prime is 986389051. The reversal of 986389021 is 120983689.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 899340121 + 87048900 = 29989^2 + 9330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-986389021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (986389051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493194510 + 493194511.

It is an arithmetic number, because the mean of its divisors is an integer number (493194511).

Almost surely, 2^986389021 is an apocalyptic number.

It is an amenable number.

986389021 is a deficient number, since it is larger than the sum of its proper divisors (1).

986389021 is an equidigital number, since it uses as much as digits as its factorization.

986389021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 986389021 is about 31406.8308015947. The cubic root of 986389021 is about 995.4422656165.

The spelling of 986389021 in words is "nine hundred eighty-six million, three hundred eighty-nine thousand, twenty-one".