42755409 has 12 divisors (see below), whose sum is σ = 61827636. Its totient is φ = 28471392.

The previous prime is 42755407. The next prime is 42755411. The reversal of 42755409 is 90455724.

42755409 is a `hidden beast` number, since 42 + 75 + 540 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (42755407) and next prime (42755411).

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 39727809 = 1740^2 + 6303^2 .

It is not a de Polignac number, because 42755409 - 2¹ = 42755407 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42755407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7927 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (5152303).

Almost surely, 2^42755409 is an apocalyptic number.

It is an amenable number.

42755409 is a deficient number, since it is larger than the sum of its proper divisors (19072227).

42755409 is a wasteful number, since it uses less digits than its factorization.

42755409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5376 (or 5373 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 42755409 is about 6538.7620387960. The cubic root of 42755409 is about 349.6742792813.

The spelling of 42755409 in words is "forty-two million, seven hundred fifty-five thousand, four hundred nine".