55640043 has 6 divisors (see below), whose sum is σ = 80368964. Its totient is φ = 37093356.

The previous prime is 55640033. The next prime is 55640047. The reversal of 55640043 is 34004655.

It is not a de Polignac number, because 55640043 - 2⁹ = 55639531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55639989 and 55640016.

It is not an unprimeable number, because it can be changed into a prime (55640047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3091105 + ... + 3091122.

Almost surely, 2^55640043 is an apocalyptic number.

55640043 is a deficient number, since it is larger than the sum of its proper divisors (24728921).

55640043 is a wasteful number, since it uses less digits than its factorization.

55640043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182233 (or 6182230 counting only the distinct ones).

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

The square root of 55640043 is about 7459.2253619260. The cubic root of 55640043 is about 381.7647441757.

Adding to 55640043 its reverse (34004655), we get a palindrome (89644698).

The spelling of 55640043 in words is "fifty-five million, six hundred forty thousand, forty-three".