55401140 has 24 divisors (see below), whose sum is σ = 116605440. Its totient is φ = 22110368.

The previous prime is 55401121. The next prime is 55401149. The reversal of 55401140 is 4110455.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55401149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6689 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (4858560).

Almost surely, 2^55401140 is an apocalyptic number.

It is an amenable number.

55401140 is an abundant number, since it is smaller than the sum of its proper divisors (61204300).

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

55401140 is a wasteful number, since it uses less digits than its factorization.

55401140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271 (or 6269 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 55401140 is about 7443.1942067905. The cubic root of 55401140 is about 381.2175627693.

Adding to 55401140 its reverse (4110455), we get a palindrome (59511595).

The spelling of 55401140 in words is "fifty-five million, four hundred one thousand, one hundred forty".