7896921 has 16 divisors (see below), whose sum is σ = 10805184. Its totient is φ = 5128704.

The previous prime is 7896901. The next prime is 7896937. The reversal of 7896921 is 1296987.

It is not a de Polignac number, because 7896921 - 2⁷ = 7896793 is a prime.

It is a super-2 number, since 2×7896921² = 124722722560482, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (7896901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23265 + ... + 23601.

It is an arithmetic number, because the mean of its divisors is an integer number (675324).

Almost surely, 2^7896921 is an apocalyptic number.

It is an amenable number.

7896921 is a deficient number, since it is larger than the sum of its proper divisors (2908263).

7896921 is a wasteful number, since it uses less digits than its factorization.

7896921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its digits is 54432, while the sum is 42.

The square root of 7896921 is about 2810.1460816121. The cubic root of 7896921 is about 199.1372923617.

The spelling of 7896921 in words is "seven million, eight hundred ninety-six thousand, nine hundred twenty-one".