55400240 has 40 divisors (see below), whose sum is σ = 147207840. Its totient is φ = 18994176.

The previous prime is 55400203. The next prime is 55400243. The reversal of 55400240 is 4200455.

It is a happy number.

55400240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (55400243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48905 + ... + 50024.

It is an arithmetic number, because the mean of its divisors is an integer number (3680196).

Almost surely, 2^55400240 is an apocalyptic number.

It is an amenable number.

55400240 is an abundant number, since it is smaller than the sum of its proper divisors (91807600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55400240 is a wasteful number, since it uses less digits than its factorization.

55400240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98949 (or 98943 counting only the distinct ones).

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

The square root of 55400240 is about 7443.1337486303. The cubic root of 55400240 is about 381.2154984455.

Adding to 55400240 its reverse (4200455), we get a palindrome (59600695).

The spelling of 55400240 in words is "fifty-five million, four hundred thousand, two hundred forty".