55143900 has 108 divisors (see below), whose sum is σ = 197560272. Its totient is φ = 12602880.

The previous prime is 55143899. The next prime is 55143929. The reversal of 55143900 is 934155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1924 + ... + 10676.

Almost surely, 2^55143900 is an apocalyptic number.

55143900 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 55143900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98780136).

55143900 is an abundant number, since it is smaller than the sum of its proper divisors (142416372).

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

55143900 is a wasteful number, since it uses less digits than its factorization.

55143900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8780 (or 8770 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 55143900 is about 7425.8938855871. The cubic root of 55143900 is about 380.6266207960.

The spelling of 55143900 in words is "fifty-five million, one hundred forty-three thousand, nine hundred".