55143423 has 10 divisors (see below), whose sum is σ = 82374864. Its totient is φ = 36762228.

The previous prime is 55143391. The next prime is 55143449. The reversal of 55143423 is 32434155.

It is not a de Polignac number, because 55143423 - 2⁵ = 55143391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55143463) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 340311 + ... + 340472.

Almost surely, 2^55143423 is an apocalyptic number.

55143423 is a deficient number, since it is larger than the sum of its proper divisors (27231441).

55143423 is an equidigital number, since it uses as much as digits as its factorization.

55143423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680795 (or 680786 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 55143423 is about 7425.8617681721. The cubic root of 55143423 is about 380.6255233073.

Adding to 55143423 its reverse (32434155), we get a palindrome (87577578).

The spelling of 55143423 in words is "fifty-five million, one hundred forty-three thousand, four hundred twenty-three".