1898730 has 72 divisors (see below), whose sum is σ = 5316012. Its totient is φ = 470016.

The previous prime is 1898711. The next prime is 1898737. The reversal of 1898730 is 378981.

It can be written as a sum of positive squares in 6 ways, for example, as 1418481 + 480249 = 1191^2 + 693^2 .

It is a super-2 number, since 2×1898730² = 7210351225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1898737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25974 + ... + 26046.

2^1898730 is an apocalyptic number.

1898730 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 1898730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2658006).

1898730 is an abundant number, since it is smaller than the sum of its proper divisors (3417282).

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

1898730 is a wasteful number, since it uses less digits than its factorization.

1898730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1898730 is about 1377.9441207828. The cubic root of 1898730 is about 123.8286307743.

It can be divided in two parts, 1898 and 730, that added together give a triangular number (2628 = T₇₂).

The spelling of 1898730 in words is "one million, eight hundred ninety-eight thousand, seven hundred thirty".