842384374225 has 45 divisors (see below), whose sum is σ = 1095192448987. Its totient is φ = 642749515760.

The previous prime is 842384374217. The next prime is 842384374229. The reversal of 842384374225 is 522473483248.

It is a happy number.

The square root of 842384374225 is 917815.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 303258374721 + 539125999504 = 550689^2 + 734252^2 .

It is not a de Polignac number, because 842384374225 - 2³ = 842384374217 is a prime.

It is a super-2 number, since 2×842384374225² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842384374229) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2427620502 + ... + 2427620848.

Almost surely, 2^842384374225 is an apocalyptic number.

842384374225 is the 917815-th square number.

842384374225 is the 458908-th centered octagonal number.

It is an amenable number.

842384374225 is a deficient number, since it is larger than the sum of its proper divisors (252808074762).

842384374225 is an frugal number, since it uses more digits than its factorization.

842384374225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 375 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 52.

It can be divided in two parts, 842384 and 374225, that added together give a square (1216609 = 1103²).

The spelling of 842384374225 in words is "eight hundred forty-two billion, three hundred eighty-four million, three hundred seventy-four thousand, two hundred twenty-five".