55638923 has 4 divisors (see below), whose sum is σ = 56688768. Its totient is φ = 54589080.

The previous prime is 55638917. The next prime is 55638931. The reversal of 55638923 is 32983655.

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 55638923 - 2²² = 51444619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55638953) 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, 524843 + ... + 524948.

It is an arithmetic number, because the mean of its divisors is an integer number (14172192).

Almost surely, 2^55638923 is an apocalyptic number.

55638923 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

55638923 is a deficient number, since it is larger than the sum of its proper divisors (1049845).

55638923 is a wasteful number, since it uses less digits than its factorization.

55638923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049844.

The product of its digits is 194400, while the sum is 41.

The square root of 55638923 is about 7459.1502867284. The cubic root of 55638923 is about 381.7621825950.

The spelling of 55638923 in words is "fifty-five million, six hundred thirty-eight thousand, nine hundred twenty-three".