7698921 has 4 divisors (see below), whose sum is σ = 10265232. Its totient is φ = 5132612.

The previous prime is 7698917. The next prime is 7698931. The reversal of 7698921 is 1298967.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1298967 = 3 ⋅432989.

It is a cyclic number.

It is not a de Polignac number, because 7698921 - 2² = 7698917 is a prime.

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

It is a Curzon number.

7698921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7698931) 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, 1283151 + ... + 1283156.

It is an arithmetic number, because the mean of its divisors is an integer number (2566308).

Almost surely, 2^7698921 is an apocalyptic number.

It is an amenable number.

7698921 is a deficient number, since it is larger than the sum of its proper divisors (2566311).

7698921 is a wasteful number, since it uses less digits than its factorization.

7698921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566310.

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

The square root of 7698921 is about 2774.6929559863. The cubic root of 7698921 is about 197.4588580648.

The spelling of 7698921 in words is "seven million, six hundred ninety-eight thousand, nine hundred twenty-one".