55438813 has 8 divisors (see below), whose sum is σ = 56643200. Its totient is φ = 54244080.

The previous prime is 55438811. The next prime is 55438841. The reversal of 55438813 is 31883455.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55438813 - 2¹ = 55438811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55438811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9856 + ... + 14422.

It is an arithmetic number, because the mean of its divisors is an integer number (7080400).

Almost surely, 2^55438813 is an apocalyptic number.

It is an amenable number.

55438813 is a deficient number, since it is larger than the sum of its proper divisors (1204387).

55438813 is a wasteful number, since it uses less digits than its factorization.

55438813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827.

The product of its digits is 57600, while the sum is 37.

The square root of 55438813 is about 7445.7244778463. The cubic root of 55438813 is about 381.3039530202.

The spelling of 55438813 in words is "fifty-five million, four hundred thirty-eight thousand, eight hundred thirteen".