55400242 has 8 divisors (see below), whose sum is σ = 83144556. Its totient is φ = 27685392.

The previous prime is 55400203. The next prime is 55400243. The reversal of 55400242 is 24200455.

It can be written as a sum of positive squares in 2 ways, for example, as 36832761 + 18567481 = 6069^2 + 4309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (55400243) 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, 1833 + ... + 10684.

Almost surely, 2^55400242 is an apocalyptic number.

55400242 is a deficient number, since it is larger than the sum of its proper divisors (27744314).

55400242 is a wasteful number, since it uses less digits than its factorization.

55400242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14732.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 55400242 is about 7443.1338829824. The cubic root of 55400242 is about 381.2155030329.

Adding to 55400242 its reverse (24200455), we get a palindrome (79600697).

The spelling of 55400242 in words is "fifty-five million, four hundred thousand, two hundred forty-two".