840025407841 has 9 divisors (see below), whose sum is σ = 856223504409. Its totient is φ = 824128212336.

The previous prime is 840025407839. The next prime is 840025407853. The reversal of 840025407841 is 148704520048.

The square root of 840025407841 is 916529.

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

It can be written as a sum of positive squares in 4 ways, for example, as 99806078241 + 740219329600 = 315921^2 + 860360^2 .

It is not a de Polignac number, because 840025407841 - 2¹ = 840025407839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840025407941) 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 8 ways as a sum of consecutive naturals, for example, 48567391 + ... + 48584683.

Almost surely, 2^840025407841 is an apocalyptic number.

840025407841 is the 916529-th square number.

840025407841 is the 458265-th centered octagonal number.

It is an amenable number.

840025407841 is a deficient number, since it is larger than the sum of its proper divisors (16198096568).

840025407841 is an frugal number, since it uses more digits than its factorization.

840025407841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34692 (or 17346 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 43.

Adding to 840025407841 its reverse (148704520048), we get a palindrome (988729927889).

The spelling of 840025407841 in words is "eight hundred forty billion, twenty-five million, four hundred seven thousand, eight hundred forty-one".