55638389 has 2 divisors, whose sum is σ = 55638390. Its totient is φ = 55638388.

The previous prime is 55638371. The next prime is 55638409. The reversal of 55638389 is 98383655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55383364 + 255025 = 7442^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 55638389 - 2²⁰ = 54589813 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55638589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27819194 + 27819195.

It is an arithmetic number, because the mean of its divisors is an integer number (27819195).

Almost surely, 2^55638389 is an apocalyptic number.

It is an amenable number.

55638389 is a deficient number, since it is larger than the sum of its proper divisors (1).

55638389 is an equidigital number, since it uses as much as digits as its factorization.

55638389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The square root of 55638389 is about 7459.1144916806. The cubic root of 55638389 is about 381.7609612578.

The spelling of 55638389 in words is "fifty-five million, six hundred thirty-eight thousand, three hundred eighty-nine".