7851881 has 8 divisors (see below), whose sum is σ = 8128200. Its totient is φ = 7579008.

The previous prime is 7851871. The next prime is 7851887. The reversal of 7851881 is 1881587.

It can be written as a sum of positive squares in 4 ways, for example, as 2371600 + 5480281 = 1540^2 + 2341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7851881 - 2¹⁴ = 7835497 is a prime.

It is a super-3 number, since 3×7851881³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7851887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4295 + ... + 5843.

It is an arithmetic number, because the mean of its divisors is an integer number (1016025).

Almost surely, 2^7851881 is an apocalyptic number.

It is an amenable number.

7851881 is a deficient number, since it is larger than the sum of its proper divisors (276319).

7851881 is a wasteful number, since it uses less digits than its factorization.

7851881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its digits is 17920, while the sum is 38.

The square root of 7851881 is about 2802.1208039626. The cubic root of 7851881 is about 198.7579778716.

The spelling of 7851881 in words is "seven million, eight hundred fifty-one thousand, eight hundred eighty-one".