7721879 has 8 divisors (see below), whose sum is σ = 8511888. Its totient is φ = 6946560.

The previous prime is 7721873. The next prime is 7721891. The reversal of 7721879 is 9781277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7721879 - 2¹² = 7717783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552 + ... + 4685.

It is an arithmetic number, because the mean of its divisors is an integer number (1063986).

Almost surely, 2^7721879 is an apocalyptic number.

7721879 is a deficient number, since it is larger than the sum of its proper divisors (790009).

7721879 is a wasteful number, since it uses less digits than its factorization.

7721879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7345.

The product of its digits is 49392, while the sum is 41.

The square root of 7721879 is about 2778.8269107665. The cubic root of 7721879 is about 197.6549358393.

The spelling of 7721879 in words is "seven million, seven hundred twenty-one thousand, eight hundred seventy-nine".