55238399 has 2 divisors, whose sum is σ = 55238400. Its totient is φ = 55238398.

The previous prime is 55238383. The next prime is 55238419. The reversal of 55238399 is 99383255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55238399 - 2⁴ = 55238383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55238329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27619199 + 27619200.

It is an arithmetic number, because the mean of its divisors is an integer number (27619200).

Almost surely, 2^55238399 is an apocalyptic number.

55238399 is a deficient number, since it is larger than the sum of its proper divisors (1).

55238399 is an equidigital number, since it uses as much as digits as its factorization.

55238399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 44.

The square root of 55238399 is about 7432.2539649826. The cubic root of 55238399 is about 380.8439207948.

The spelling of 55238399 in words is "fifty-five million, two hundred thirty-eight thousand, three hundred ninety-nine".