875428409 has 4 divisors (see below), whose sum is σ = 875503860. Its totient is φ = 875352960.

The previous prime is 875428361. The next prime is 875428417. The reversal of 875428409 is 904824578.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26988025 + 848440384 = 5195^2 + 29128^2 .

It is a cyclic number.

It is not a de Polignac number, because 875428409 - 2¹² = 875424313 is a prime.

It is a super-3 number, since 3×875428409³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (875428429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16244 + ... + 44885.

It is an arithmetic number, because the mean of its divisors is an integer number (218875965).

Almost surely, 2^875428409 is an apocalyptic number.

It is an amenable number.

875428409 is a deficient number, since it is larger than the sum of its proper divisors (75451).

875428409 is a wasteful number, since it uses less digits than its factorization.

875428409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75450.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 875428409 is about 29587.6394631272. The cubic root of 875428409 is about 956.6216643811.

The spelling of 875428409 in words is "eight hundred seventy-five million, four hundred twenty-eight thousand, four hundred nine".