2940409 has 2 divisors, whose sum is σ = 2940410. Its totient is φ = 2940408.

The previous prime is 2940407. The next prime is 2940419. The reversal of 2940409 is 9040492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2471184 + 469225 = 1572^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2940409 - 2¹ = 2940407 is a prime.

Together with 2940407, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2940401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1470204 + 1470205.

It is an arithmetic number, because the mean of its divisors is an integer number (1470205).

2^2940409 is an apocalyptic number.

It is an amenable number.

2940409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2940409 is an equidigital number, since it uses as much as digits as its factorization.

2940409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2940409 is about 1714.7620826225. The cubic root of 2940409 is about 143.2636179207.

The spelling of 2940409 in words is "two million, nine hundred forty thousand, four hundred nine".