1800398736 has 120 divisors (see below), whose sum is σ = 5377941504. Its totient is φ = 560286720.

The previous prime is 1800398693. The next prime is 1800398767. The reversal of 1800398736 is 6378930081.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1800398691 and 1800398700.

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, 308001 + ... + 313791.

Almost surely, 2^1800398736 is an apocalyptic number.

1800398736 is a gapful number since it is divisible by the number (16) 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 1800398736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2688970752).

1800398736 is an abundant number, since it is smaller than the sum of its proper divisors (3577542768).

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

1800398736 is a wasteful number, since it uses less digits than its factorization.

1800398736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5949 (or 5940 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1800398736 is about 42431.1057598079. The cubic root of 1800398736 is about 1216.5302144421.

The spelling of 1800398736 in words is "one billion, eight hundred million, three hundred ninety-eight thousand, seven hundred thirty-six".