7879521 has 16 divisors (see below), whose sum is σ = 11370240. Its totient is φ = 4824960.

The previous prime is 7879513. The next prime is 7879523. The reversal of 7879521 is 1259787.

7879521 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7879521 - 2³ = 7879513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

7879521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7879521.

It is not an unprimeable number, because it can be changed into a prime (7879523) 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, 10600 + ... + 11318.

It is an arithmetic number, because the mean of its divisors is an integer number (710640).

Almost surely, 2^7879521 is an apocalyptic number.

It is an amenable number.

7879521 is a deficient number, since it is larger than the sum of its proper divisors (3490719).

7879521 is a wasteful number, since it uses less digits than its factorization.

7879521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016.

The product of its digits is 35280, while the sum is 39.

The square root of 7879521 is about 2807.0484498847. The cubic root of 7879521 is about 198.9909257413.

The spelling of 7879521 in words is "seven million, eight hundred seventy-nine thousand, five hundred twenty-one".