55393999 has 2 divisors, whose sum is σ = 55394000. Its totient is φ = 55393998.

The previous prime is 55393991. The next prime is 55394021. The reversal of 55393999 is 99939355.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55393999 - 2³ = 55393991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55393991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27696999 + 27697000.

It is an arithmetic number, because the mean of its divisors is an integer number (27697000).

Almost surely, 2^55393999 is an apocalyptic number.

55393999 is a deficient number, since it is larger than the sum of its proper divisors (1).

55393999 is an equidigital number, since it uses as much as digits as its factorization.

55393999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1476225, while the sum is 52.

The square root of 55393999 is about 7442.7144913667. The cubic root of 55393999 is about 381.2011828922.

The spelling of 55393999 in words is "fifty-five million, three hundred ninety-three thousand, nine hundred ninety-nine".