983989857 has 4 divisors (see below), whose sum is σ = 1311986480. Its totient is φ = 655993236.

The previous prime is 983989847. The next prime is 983989859. The reversal of 983989857 is 758989389.

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 not a de Polignac number, because 983989857 - 2¹⁰ = 983988833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (983989859) 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, 163998307 + ... + 163998312.

It is an arithmetic number, because the mean of its divisors is an integer number (327996620).

Almost surely, 2^983989857 is an apocalyptic number.

It is an amenable number.

983989857 is a deficient number, since it is larger than the sum of its proper divisors (327996623).

983989857 is a wasteful number, since it uses less digits than its factorization.

983989857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327996622.

The product of its digits is 39191040, while the sum is 66.

The square root of 983989857 is about 31368.6126087846. The cubic root of 983989857 is about 994.6345490902.

The spelling of 983989857 in words is "nine hundred eighty-three million, nine hundred eighty-nine thousand, eight hundred fifty-seven".