1898387140 has 72 divisors (see below), whose sum is σ = 4329831240. Its totient is φ = 698840064.

The previous prime is 1898387107. The next prime is 1898387159. The reversal of 1898387140 is 417838981.

It can be written as a sum of positive squares in 12 ways, for example, as 181279296 + 1717107844 = 13464^2 + 41438^2 .

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, 1544046 + ... + 1545274.

It is an arithmetic number, because the mean of its divisors is an integer number (60136545).

Almost surely, 2^1898387140 is an apocalyptic number.

1898387140 is a gapful number since it is divisible by the number (10) 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 1898387140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2164915620).

1898387140 is an abundant number, since it is smaller than the sum of its proper divisors (2431444100).

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

1898387140 is a wasteful number, since it uses less digits than its factorization.

1898387140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 1898387140 is about 43570.4847345081. The cubic root of 1898387140 is about 1238.2117694284.

The spelling of 1898387140 in words is "one billion, eight hundred ninety-eight million, three hundred eighty-seven thousand, one hundred forty".