53403609 has 32 divisors (see below), whose sum is σ = 84566016. Its totient is φ = 29344320.

The previous prime is 53403599. The next prime is 53403629. The reversal of 53403609 is 90630435.

It is a happy number.

It is not a de Polignac number, because 53403609 - 2⁷ = 53403481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53403629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59764 + ... + 60650.

It is an arithmetic number, because the mean of its divisors is an integer number (2642688).

Almost surely, 2^53403609 is an apocalyptic number.

It is an amenable number.

53403609 is a deficient number, since it is larger than the sum of its proper divisors (31162407).

53403609 is a wasteful number, since it uses less digits than its factorization.

53403609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 53403609 is about 7307.7772954572. Note that the first 3 decimals coincide. The cubic root of 53403609 is about 376.5796688246.

The spelling of 53403609 in words is "fifty-three million, four hundred three thousand, six hundred nine".