7908121 has 16 divisors (see below), whose sum is σ = 8982288. Its totient is φ = 6912000.

The previous prime is 7908107. The next prime is 7908139. The reversal of 7908121 is 1218097.

It can be written as a sum of positive squares in 8 ways, for example, as 68121 + 7840000 = 261^2 + 2800^2 .

It is a 4-Lehmer number, since φ(7908121) divides (7908121-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 7908121 - 2¹³ = 7899929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7908121.

It is not an unprimeable number, because it can be changed into a prime (7908151) 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, 19521 + ... + 19921.

It is an arithmetic number, because the mean of its divisors is an integer number (561393).

Almost surely, 2^7908121 is an apocalyptic number.

It is an amenable number.

7908121 is a deficient number, since it is larger than the sum of its proper divisors (1074167).

7908121 is a wasteful number, since it uses less digits than its factorization.

7908121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 7908121 is about 2812.1381545009. The cubic root of 7908121 is about 199.2313916566.

It can be divided in two parts, 790 and 8121, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 7908121 in words is "seven million, nine hundred eight thousand, one hundred twenty-one".