55393945 has 4 divisors (see below), whose sum is σ = 66472740. Its totient is φ = 44315152.

The previous prime is 55393937. The next prime is 55393963. The reversal of 55393945 is 54939355.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13571856 + 41822089 = 3684^2 + 6467^2 .

It is a cyclic number.

It is not a de Polignac number, because 55393945 - 2³ = 55393937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5539390 + ... + 5539399.

It is an arithmetic number, because the mean of its divisors is an integer number (16618185).

Almost surely, 2^55393945 is an apocalyptic number.

It is an amenable number.

55393945 is a deficient number, since it is larger than the sum of its proper divisors (11078795).

55393945 is a wasteful number, since it uses less digits than its factorization.

55393945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078794.

The product of its digits is 364500, while the sum is 43.

The square root of 55393945 is about 7442.7108636571. The cubic root of 55393945 is about 381.2010590228.

The spelling of 55393945 in words is "fifty-five million, three hundred ninety-three thousand, nine hundred forty-five".