840953934170405 has 12 divisors (see below), whose sum is σ = 1109225189204076. Its totient is φ = 611602861214400.

The previous prime is 840953934170351. The next prime is 840953934170407. The reversal of 840953934170405 is 504071439359048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 523678645968676 + 317275288201729 = 22884026^2 + 17812223^2 .

It is a de Polignac number, because none of the positive numbers 2^k-840953934170405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840953934170407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 695003250776 + ... + 695003251985.

It is an arithmetic number, because the mean of its divisors is an integer number (92435432433673).

Almost surely, 2^{840953934170405} is an apocalyptic number.

It is an amenable number.

840953934170405 is a deficient number, since it is larger than the sum of its proper divisors (268271255033671).

840953934170405 is a wasteful number, since it uses less digits than its factorization.

840953934170405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390006502788 (or 1390006502777 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 62.

The spelling of 840953934170405 in words is "eight hundred forty trillion, nine hundred fifty-three billion, nine hundred thirty-four million, one hundred seventy thousand, four hundred five".