55406140 has 24 divisors (see below), whose sum is σ = 116544960. Its totient is φ = 22125888.

The previous prime is 55406137. The next prime is 55406159. The reversal of 55406140 is 4160455.

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, 12454 + ... + 16306.

It is an arithmetic number, because the mean of its divisors is an integer number (4856040).

Almost surely, 2^55406140 is an apocalyptic number.

It is an amenable number.

55406140 is an abundant number, since it is smaller than the sum of its proper divisors (61138820).

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

55406140 is a wasteful number, since it uses less digits than its factorization.

55406140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4581 (or 4579 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 55406140 is about 7443.5300765161. The cubic root of 55406140 is about 381.2290308273.

Adding to 55406140 its reverse (4160455), we get a palindrome (59566595).

The spelling of 55406140 in words is "fifty-five million, four hundred six thousand, one hundred forty".