7897881 has 4 divisors (see below), whose sum is σ = 10530512. Its totient is φ = 5265252.

The previous prime is 7897873. The next prime is 7897907. The reversal of 7897881 is 1887987.

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 not a de Polignac number, because 7897881 - 2³ = 7897873 is a prime.

It is a super-2 number, since 2×7897881² = 124753048580322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7897881.

It is not an unprimeable number, because it can be changed into a prime (7897861) 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, 1316311 + ... + 1316316.

It is an arithmetic number, because the mean of its divisors is an integer number (2632628).

Almost surely, 2^7897881 is an apocalyptic number.

It is an amenable number.

7897881 is a deficient number, since it is larger than the sum of its proper divisors (2632631).

7897881 is a wasteful number, since it uses less digits than its factorization.

7897881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632630.

The product of its digits is 225792, while the sum is 48.

The square root of 7897881 is about 2810.3168860468. The cubic root of 7897881 is about 199.1453615005.

It can be divided in two parts, 7897 and 881, that added together give a palindrome (8778).

The spelling of 7897881 in words is "seven million, eight hundred ninety-seven thousand, eight hundred eighty-one".