2878409 has 2 divisors, whose sum is σ = 2878410. Its totient is φ = 2878408.

The previous prime is 2878397. The next prime is 2878429. The reversal of 2878409 is 9048782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 1149184 = 1315^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2878409 - 2⁸ = 2878153 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (2878429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1439204 + 1439205.

It is an arithmetic number, because the mean of its divisors is an integer number (1439205).

2^2878409 is an apocalyptic number.

It is an amenable number.

2878409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2878409 is an equidigital number, since it uses as much as digits as its factorization.

2878409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2878409 is about 1696.5874572211. The cubic root of 2878409 is about 142.2495281998.

The spelling of 2878409 in words is "two million, eight hundred seventy-eight thousand, four hundred nine".