55805939 has 4 divisors (see below), whose sum is σ = 63778224. Its totient is φ = 47833656.

The previous prime is 55805903. The next prime is 55805941. The reversal of 55805939 is 93950855.

It is a happy number.

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 55805939 - 2⁸ = 55805683 is a prime.

It is a super-2 number, since 2×55805939² = 6228605655343442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55805939.

It is not an unprimeable number, because it can be changed into a prime (55805969) 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, 3986132 + ... + 3986145.

It is an arithmetic number, because the mean of its divisors is an integer number (15944556).

Almost surely, 2^55805939 is an apocalyptic number.

55805939 is a deficient number, since it is larger than the sum of its proper divisors (7972285).

55805939 is an equidigital number, since it uses as much as digits as its factorization.

55805939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7972284.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 55805939 is about 7470.3372748491. The cubic root of 55805939 is about 382.1437901528.

The spelling of 55805939 in words is "fifty-five million, eight hundred five thousand, nine hundred thirty-nine".