55403400 has 96 divisors (see below), whose sum is σ = 184988160. Its totient is φ = 13635840.

The previous prime is 55403371. The next prime is 55403429. The reversal of 55403400 is 430455.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55403371) and next prime (55403429).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4249 + ... + 11351.

It is an arithmetic number, because the mean of its divisors is an integer number (1926960).

Almost surely, 2^55403400 is an apocalyptic number.

55403400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55403400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92494080).

55403400 is an abundant number, since it is smaller than the sum of its proper divisors (129584760).

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

55403400 is a wasteful number, since it uses less digits than its factorization.

55403400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135 (or 7126 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55403400 is about 7443.3460217835. The cubic root of 55403400 is about 381.2227464170. Note that the first 3 decimals are identical.

Adding to 55403400 its reverse (430455), we get a palindrome (55833855).

The spelling of 55403400 in words is "fifty-five million, four hundred three thousand, four hundred".