1899540 has 72 divisors (see below), whose sum is σ = 5890248. Its totient is φ = 495360.

The previous prime is 1899523. The next prime is 1899589. The reversal of 1899540 is 459981.

It can be written as a sum of positive squares in 4 ways, for example, as 125316 + 1774224 = 354^2 + 1332^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1899495 and 1899504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10894 + ... + 11066.

It is an arithmetic number, because the mean of its divisors is an integer number (81809).

2^1899540 is an apocalyptic number.

1899540 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 1899540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2945124).

1899540 is an abundant number, since it is smaller than the sum of its proper divisors (3990708).

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

1899540 is a wasteful number, since it uses less digits than its factorization.

1899540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1899540 is about 1378.2380055709. The cubic root of 1899540 is about 123.8462367410.

The spelling of 1899540 in words is "one million, eight hundred ninety-nine thousand, five hundred forty".