54215440 has 40 divisors (see below), whose sum is σ = 128741760. Its totient is φ = 21223296.

The previous prime is 54215423. The next prime is 54215443. The reversal of 54215440 is 4451245.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (54215443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3450 + ... + 10969.

It is an arithmetic number, because the mean of its divisors is an integer number (3218544).

Almost surely, 2^54215440 is an apocalyptic number.

It is an amenable number.

54215440 is an abundant number, since it is smaller than the sum of its proper divisors (74526320).

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

54215440 is a wasteful number, since it uses less digits than its factorization.

54215440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14479 (or 14473 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 54215440 is about 7363.1134718949. The cubic root of 54215440 is about 378.4783098032.

Adding to 54215440 its reverse (4451245), we get a palindrome (58666685).

The spelling of 54215440 in words is "fifty-four million, two hundred fifteen thousand, four hundred forty".