55400222 has 4 divisors (see below), whose sum is σ = 83100336. Its totient is φ = 27700110.

The previous prime is 55400203. The next prime is 55400243. The reversal of 55400222 is 22200455.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 55400194 and 55400203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13850054 + ... + 13850057.

It is an arithmetic number, because the mean of its divisors is an integer number (20775084).

Almost surely, 2^55400222 is an apocalyptic number.

55400222 is a deficient number, since it is larger than the sum of its proper divisors (27700114).

55400222 is a wasteful number, since it uses less digits than its factorization.

55400222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27700113.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 55400222 is about 7443.1325394621. The cubic root of 55400222 is about 381.2154571588.

Adding to 55400222 its reverse (22200455), we get a palindrome (77600677).

The spelling of 55400222 in words is "fifty-five million, four hundred thousand, two hundred twenty-two".