55740239 has 2 divisors, whose sum is σ = 55740240. Its totient is φ = 55740238.

The previous prime is 55740211. The next prime is 55740253. The reversal of 55740239 is 93204755.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55740239 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55740199 and 55740208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55740439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27870119 + 27870120.

It is an arithmetic number, because the mean of its divisors is an integer number (27870120).

Almost surely, 2^55740239 is an apocalyptic number.

55740239 is a deficient number, since it is larger than the sum of its proper divisors (1).

55740239 is an equidigital number, since it uses as much as digits as its factorization.

55740239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 55740239 is about 7465.9385880142. The cubic root of 55740239 is about 381.9937660596.

The spelling of 55740239 in words is "fifty-five million, seven hundred forty thousand, two hundred thirty-nine".