7921087 has 2 divisors, whose sum is σ = 7921088. Its totient is φ = 7921086.

The previous prime is 7921061. The next prime is 7921129. The reversal of 7921087 is 7801297.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7921087 - 2⁷ = 7920959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7921057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960543 + 3960544.

It is an arithmetic number, because the mean of its divisors is an integer number (3960544).

Almost surely, 2^7921087 is an apocalyptic number.

7921087 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921087 is an equidigital number, since it uses as much as digits as its factorization.

7921087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 7921087 is about 2814.4425735836. The cubic root of 7921087 is about 199.3402174953.

It can be divided in two parts, 79210 and 87, that added together give a palindrome (79297).

The spelling of 7921087 in words is "seven million, nine hundred twenty-one thousand, eighty-seven".