841398989 has 4 divisors (see below), whose sum is σ = 842688156. Its totient is φ = 840109824.

The previous prime is 841398979. The next prime is 841398997. The reversal of 841398989 is 989893148.

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 536617225 + 304781764 = 23165^2 + 17458^2 .

It is a cyclic number.

It is not a de Polignac number, because 841398989 - 2²⁴ = 824621773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (841398959) 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, 643604 + ... + 644909.

It is an arithmetic number, because the mean of its divisors is an integer number (210672039).

Almost surely, 2^841398989 is an apocalyptic number.

It is an amenable number.

841398989 is a deficient number, since it is larger than the sum of its proper divisors (1289167).

841398989 is a wasteful number, since it uses less digits than its factorization.

841398989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289166.

The product of its digits is 4478976, while the sum is 59.

The square root of 841398989 is about 29006.8783049814. The cubic root of 841398989 is about 944.0623152181.

The spelling of 841398989 in words is "eight hundred forty-one million, three hundred ninety-eight thousand, nine hundred eighty-nine".