7843657226409 has 9 divisors (see below), whose sum is σ = 11329739240989. Its totient is φ = 5229099216300.

The previous prime is 7843657226387. The next prime is 7843657226473. The reversal of 7843657226409 is 9046227563487.

The square root of 7843657226409 is 2800653.

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

7843657226409 is a `hidden beast` number, since 7 + 8 + 4 + 36 + 572 + 26 + 4 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 7843657226409 - 2³⁹ = 7293901412521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7843657222409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7935184 + ... + 8868734.

Almost surely, 2^{7843657226409} is an apocalyptic number.

7843657226409 is the 2800653-rd square number.

7843657226409 is the 1400327-th centered octagonal number.

It is an amenable number.

7843657226409 is a deficient number, since it is larger than the sum of its proper divisors (3486082014580).

7843657226409 is an frugal number, since it uses more digits than its factorization.

7843657226409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867108 (or 933554 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 63.

The spelling of 7843657226409 in words is "seven trillion, eight hundred forty-three billion, six hundred fifty-seven million, two hundred twenty-six thousand, four hundred nine".