842398551 has 12 divisors (see below), whose sum is σ = 1219626720. Its totient is φ = 560293440.

The previous prime is 842398549. The next prime is 842398553. The reversal of 842398551 is 155893248.

842398551 is a `hidden beast` number, since 8 + 4 + 2 + 3 + 98 + 551 = 666.

It is an interprime number because it is at equal distance from previous prime (842398549) and next prime (842398553).

It is not a de Polignac number, because 842398551 - 2¹ = 842398549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 842398497 and 842398506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842398553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104706 + ... + 112463.

It is an arithmetic number, because the mean of its divisors is an integer number (101635560).

Almost surely, 2^842398551 is an apocalyptic number.

842398551 is a deficient number, since it is larger than the sum of its proper divisors (377228169).

842398551 is a wasteful number, since it uses less digits than its factorization.

842398551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217606 (or 217603 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 842398551 is about 29024.1029318737. The cubic root of 842398551 is about 944.4360084747.

The spelling of 842398551 in words is "eight hundred forty-two million, three hundred ninety-eight thousand, five hundred fifty-one".