4002109 has 2 divisors, whose sum is σ = 4002110. Its totient is φ = 4002108.

The previous prime is 4002101. The next prime is 4002113. The reversal of 4002109 is 9012004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3694084 + 308025 = 1922^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002109 - 2³ = 4002101 is a prime.

4002109 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4002092 and 4002101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4002101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2001054 + 2001055.

It is an arithmetic number, because the mean of its divisors is an integer number (2001055).

Almost surely, 2^4002109 is an apocalyptic number.

It is an amenable number.

4002109 is a deficient number, since it is larger than the sum of its proper divisors (1).

4002109 is an equidigital number, since it uses as much as digits as its factorization.

4002109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 4002109 is about 2000.5271805202. The cubic root of 4002109 is about 158.7679988686.

The spelling of 4002109 in words is "four million, two thousand, one hundred nine".