55409889 has 16 divisors (see below), whose sum is σ = 75513600. Its totient is φ = 36132096.

The previous prime is 55409873. The next prime is 55409933. The reversal of 55409889 is 98890455.

It is a happy number.

It is not a de Polignac number, because 55409889 - 2⁴ = 55409873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55409869) 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, 25747 + ... + 27815.

It is an arithmetic number, because the mean of its divisors is an integer number (4719600).

Almost surely, 2^55409889 is an apocalyptic number.

It is an amenable number.

55409889 is a deficient number, since it is larger than the sum of its proper divisors (20103711).

55409889 is a wasteful number, since it uses less digits than its factorization.

55409889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 518400, while the sum is 48.

The square root of 55409889 is about 7443.7819016949. The cubic root of 55409889 is about 381.2376291247.

The spelling of 55409889 in words is "fifty-five million, four hundred nine thousand, eight hundred eighty-nine".