55447439 has 2 divisors, whose sum is σ = 55447440. Its totient is φ = 55447438.

The previous prime is 55447417. The next prime is 55447463. The reversal of 55447439 is 93474455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55447439 - 2²⁰ = 54398863 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 55447396 and 55447405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55447409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27723719 + 27723720.

It is an arithmetic number, because the mean of its divisors is an integer number (27723720).

Almost surely, 2^55447439 is an apocalyptic number.

55447439 is a deficient number, since it is larger than the sum of its proper divisors (1).

55447439 is an equidigital number, since it uses as much as digits as its factorization.

55447439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 41.

The square root of 55447439 is about 7446.3037139241. The cubic root of 55447439 is about 381.3237283192.

The spelling of 55447439 in words is "fifty-five million, four hundred forty-seven thousand, four hundred thirty-nine".