4008121 has 4 divisors (see below), whose sum is σ = 4316452. Its totient is φ = 3699792.

The previous prime is 4008097. The next prime is 4008131. The reversal of 4008121 is 1218004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2062096 + 1946025 = 1436^2 + 1395^2 .

It is a cyclic number.

It is not a de Polignac number, because 4008121 - 2⁵ = 4008089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4008095 and 4008104.

It is not an unprimeable number, because it can be changed into a prime (4008131) 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, 154146 + ... + 154171.

It is an arithmetic number, because the mean of its divisors is an integer number (1079113).

Almost surely, 2^4008121 is an apocalyptic number.

It is an amenable number.

4008121 is a deficient number, since it is larger than the sum of its proper divisors (308331).

4008121 is a wasteful number, since it uses less digits than its factorization.

4008121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308330.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 4008121 is about 2002.0292205660. The cubic root of 4008121 is about 158.8474599434.

The spelling of 4008121 in words is "four million, eight thousand, one hundred twenty-one".