1806398550 has 192 divisors, whose sum is σ = 5487505920. Its totient is φ = 433296000.

The previous prime is 1806398537. The next prime is 1806398569. The reversal of 1806398550 is 558936081.

1806398550 is a `hidden beast` number, since 1 + 8 + 0 + 6 + 3 + 98 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 1806398496 and 1806398505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1528960 + ... + 1530140.

It is an arithmetic number, because the mean of its divisors is an integer number (28580760).

Almost surely, 2^1806398550 is an apocalyptic number.

1806398550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1806398550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743752960).

1806398550 is an abundant number, since it is smaller than the sum of its proper divisors (3681107370).

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

1806398550 is a wasteful number, since it uses less digits than its factorization.

1806398550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 1806398550 is about 42501.7476111277. The cubic root of 1806398550 is about 1217.8800750667.

The spelling of 1806398550 in words is "one billion, eight hundred six million, three hundred ninety-eight thousand, five hundred fifty".