7121887 has 4 divisors (see below), whose sum is σ = 7128160. Its totient is φ = 7115616.

The previous prime is 7121879. The next prime is 7121921. The reversal of 7121887 is 7881217.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7121887 - 2³ = 7121879 is a prime.

It is a super-3 number, since 3×7121887³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

Its product of digits (6272) is a multiple of the sum of its prime divisors (6272).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121867) 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, 903 + ... + 3880.

It is an arithmetic number, because the mean of its divisors is an integer number (1782040).

Almost surely, 2^7121887 is an apocalyptic number.

7121887 is a deficient number, since it is larger than the sum of its proper divisors (6273).

7121887 is a wasteful number, since it uses less digits than its factorization.

7121887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272.

The product of its digits is 6272, while the sum is 34.

The square root of 7121887 is about 2668.6863809747. The cubic root of 7121887 is about 192.3970281914.

It can be divided in two parts, 7121 and 887, that added together give a palindrome (8008).

The spelling of 7121887 in words is "seven million, one hundred twenty-one thousand, eight hundred eighty-seven".