1898490840 has 128 divisors (see below), whose sum is σ = 6135091200. Its totient is φ = 468610560.

The previous prime is 1898490799. The next prime is 1898490851. The reversal of 1898490840 is 480948981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74466 + ... + 96654.

It is an arithmetic number, because the mean of its divisors is an integer number (47930400).

Almost surely, 2^1898490840 is an apocalyptic number.

1898490840 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 1898490840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3067545600).

1898490840 is an abundant number, since it is smaller than the sum of its proper divisors (4236600360).

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

1898490840 is a wasteful number, since it uses less digits than its factorization.

1898490840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22257 (or 22253 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 51.

The square root of 1898490840 is about 43571.6747440353. The cubic root of 1898490840 is about 1238.2343149215.

The spelling of 1898490840 in words is "one billion, eight hundred ninety-eight million, four hundred ninety thousand, eight hundred forty".