55808393 has 4 divisors (see below), whose sum is σ = 56048148. Its totient is φ = 55568640.

The previous prime is 55808381. The next prime is 55808413. The reversal of 55808393 is 39380855.

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 38402809 + 17405584 = 6197^2 + 4172^2 .

It is a cyclic number.

It is not a de Polignac number, because 55808393 - 2⁶ = 55808329 is a prime.

It is a super-2 number, since 2×55808393² = 6229153458484898, 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 55808393.

It is not an unprimeable number, because it can be changed into a prime (55808303) 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, 119528 + ... + 119993.

It is an arithmetic number, because the mean of its divisors is an integer number (14012037).

Almost surely, 2^55808393 is an apocalyptic number.

It is an amenable number.

55808393 is a deficient number, since it is larger than the sum of its proper divisors (239755).

55808393 is a wasteful number, since it uses less digits than its factorization.

55808393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239754.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 55808393 is about 7470.5015226556. The cubic root of 55808393 is about 382.1493915107.

The spelling of 55808393 in words is "fifty-five million, eight hundred eight thousand, three hundred ninety-three".