55405040 has 40 divisors (see below), whose sum is σ = 136397520. Its totient is φ = 20857856.

The previous prime is 55404997. The next prime is 55405067. The reversal of 55405040 is 4050455.

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

It is a junction number, because it is equal to n+sod(n) for n = 55404997 and 55405015.

It is a congruent number.

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, 19010 + ... + 21729.

It is an arithmetic number, because the mean of its divisors is an integer number (3409938).

Almost surely, 2^55405040 is an apocalyptic number.

It is an amenable number.

55405040 is an abundant number, since it is smaller than the sum of its proper divisors (80992480).

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

55405040 is a wasteful number, since it uses less digits than its factorization.

55405040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40769 (or 40763 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 55405040 is about 7443.4561864768. The cubic root of 55405040 is about 381.2265079138.

Adding to 55405040 its reverse (4050455), we get a palindrome (59455495).

It can be divided in two parts, 5 and 5405040, that added together give a palindrome (5405045).

The spelling of 55405040 in words is "fifty-five million, four hundred five thousand, forty".