7857881 has 4 divisors (see below), whose sum is σ = 8199552. Its totient is φ = 7516212.

The previous prime is 7857853. The next prime is 7857917. The reversal of 7857881 is 1887587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7857881 - 2¹⁴ = 7841497 is a prime.

It is a super-2 number, since 2×7857881² = 123492587620322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7857481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170801 + ... + 170846.

It is an arithmetic number, because the mean of its divisors is an integer number (2049888).

Almost surely, 2^7857881 is an apocalyptic number.

It is an amenable number.

7857881 is a deficient number, since it is larger than the sum of its proper divisors (341671).

7857881 is a wasteful number, since it uses less digits than its factorization.

7857881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341670.

The product of its digits is 125440, while the sum is 44.

The square root of 7857881 is about 2803.1912171666. The cubic root of 7857881 is about 198.8085918257.

The spelling of 7857881 in words is "seven million, eight hundred fifty-seven thousand, eight hundred eighty-one".