55404389 has 4 divisors (see below), whose sum is σ = 55420524. Its totient is φ = 55388256.

The previous prime is 55404383. The next prime is 55404403. The reversal of 55404389 is 98340455.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47748100 + 7656289 = 6910^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 55404389 - 2²⁰ = 54355813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55404383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (13855131).

Almost surely, 2^55404389 is an apocalyptic number.

It is an amenable number.

55404389 is a deficient number, since it is larger than the sum of its proper divisors (16135).

55404389 is a wasteful number, since it uses less digits than its factorization.

55404389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16134.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 55404389 is about 7443.4124566626. The cubic root of 55404389 is about 381.2250147919.

The spelling of 55404389 in words is "fifty-five million, four hundred four thousand, three hundred eighty-nine".