842209998399 has 144 divisors (see below), whose sum is σ = 1626194568960. Its totient is φ = 414191232000.

The previous prime is 842209998359. The next prime is 842209998401. The reversal of 842209998399 is 993899902248.

It is a happy number.

842209998399 is a `hidden beast` number, since 8 + 4 + 220 + 9 + 9 + 9 + 8 + 399 = 666.

842209998399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 917720²-1.

It is not a de Polignac number, because 842209998399 - 2¹² = 842209994303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842209998359) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 191801494 + ... + 191805884.

It is an arithmetic number, because the mean of its divisors is an integer number (11293017840).

Almost surely, 2^842209998399 is an apocalyptic number.

842209998399 is a deficient number, since it is larger than the sum of its proper divisors (783984570561).

842209998399 is a wasteful number, since it uses less digits than its factorization.

842209998399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6522 (or 6512 counting only the distinct ones).

The product of its (nonzero) digits is 181398528, while the sum is 72.

The spelling of 842209998399 in words is "eight hundred forty-two billion, two hundred nine million, nine hundred ninety-eight thousand, three hundred ninety-nine".