55518442 has 16 divisors (see below), whose sum is σ = 96100992. Its totient is φ = 23562000.

The previous prime is 55518433. The next prime is 55518473. The reversal of 55518442 is 24481555.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55518398 and 55518407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17809 + ... + 20692.

It is an arithmetic number, because the mean of its divisors is an integer number (6006312).

Almost surely, 2^55518442 is an apocalyptic number.

55518442 is a deficient number, since it is larger than the sum of its proper divisors (40582550).

55518442 is a wasteful number, since it uses less digits than its factorization.

55518442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38613.

The product of its digits is 32000, while the sum is 34.

The square root of 55518442 is about 7451.0698560677. The cubic root of 55518442 is about 381.4864264252.

Adding to 55518442 its reverse (24481555), we get a palindrome (79999997).

The spelling of 55518442 in words is "fifty-five million, five hundred eighteen thousand, four hundred forty-two".