55423939 has 4 divisors (see below), whose sum is σ = 57211840. Its totient is φ = 53636040.

The previous prime is 55423937. The next prime is 55423987. The reversal of 55423939 is 93932455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55423939 - 2¹ = 55423937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55423933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893904 + ... + 893965.

It is an arithmetic number, because the mean of its divisors is an integer number (14302960).

Almost surely, 2^55423939 is an apocalyptic number.

55423939 is a deficient number, since it is larger than the sum of its proper divisors (1787901).

55423939 is a wasteful number, since it uses less digits than its factorization.

55423939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787900.

The product of its digits is 145800, while the sum is 40.

The square root of 55423939 is about 7444.7255825853. The cubic root of 55423939 is about 381.2698492219.

The spelling of 55423939 in words is "fifty-five million, four hundred twenty-three thousand, nine hundred thirty-nine".