7879621 has 4 divisors (see below), whose sum is σ = 8062912. Its totient is φ = 7696332.

The previous prime is 7879609. The next prime is 7879637. The reversal of 7879621 is 1269787.

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: 1269787 = 743 ⋅1709.

It is a cyclic number.

It is not a de Polignac number, because 7879621 - 2⁵ = 7879589 is a prime.

It is a Duffinian number.

7879621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7879021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91581 + ... + 91666.

It is an arithmetic number, because the mean of its divisors is an integer number (2015728).

Almost surely, 2^7879621 is an apocalyptic number.

It is an amenable number.

7879621 is a deficient number, since it is larger than the sum of its proper divisors (183291).

7879621 is a wasteful number, since it uses less digits than its factorization.

7879621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183290.

The product of its digits is 42336, while the sum is 40.

The square root of 7879621 is about 2807.0662621321. The cubic root of 7879621 is about 198.9917675441.

The spelling of 7879621 in words is "seven million, eight hundred seventy-nine thousand, six hundred twenty-one".