53409909 has 16 divisors (see below), whose sum is σ = 84193920. Its totient is φ = 29467200.

The previous prime is 53409883. The next prime is 53409943. The reversal of 53409909 is 90990435.

It is a happy number.

It is not a de Polignac number, because 53409909 - 2¹² = 53405813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53405909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43242 + ... + 44459.

It is an arithmetic number, because the mean of its divisors is an integer number (5262120).

Almost surely, 2^53409909 is an apocalyptic number.

It is an amenable number.

53409909 is a deficient number, since it is larger than the sum of its proper divisors (30784011).

53409909 is a wasteful number, since it uses less digits than its factorization.

53409909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87740.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 53409909 is about 7308.2083303639. The cubic root of 53409909 is about 376.5944765543.

The spelling of 53409909 in words is "fifty-three million, four hundred nine thousand, nine hundred nine".