42900409 has 2 divisors, whose sum is σ = 42900410. Its totient is φ = 42900408.

The previous prime is 42900383. The next prime is 42900413. The reversal of 42900409 is 90400924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36036009 + 6864400 = 6003^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 42900409 - 2⁷ = 42900281 is a prime.

It is not a weakly prime, because it can be changed into another prime (42900449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21450204 + 21450205.

It is an arithmetic number, because the mean of its divisors is an integer number (21450205).

Almost surely, 2^42900409 is an apocalyptic number.

It is an amenable number.

42900409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42900409 is an equidigital number, since it uses as much as digits as its factorization.

42900409 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 42900409 is about 6549.8403797345. The cubic root of 42900409 is about 350.0691264824.

The spelling of 42900409 in words is "forty-two million, nine hundred thousand, four hundred nine".