1889640 has 96 divisors (see below), whose sum is σ = 6388200. Its totient is φ = 483840.

The previous prime is 1889621. The next prime is 1889647. The reversal of 1889640 is 469881.

It is a happy number.

1889640 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 640 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 933156 + 956484 = 966^2 + 978^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1889595 and 1889604.

It is not an unprimeable number, because it can be changed into a prime (1889647) by changing a digit.

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, 10350 + ... + 10530.

2^1889640 is an apocalyptic number.

1889640 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 1889640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3194100).

1889640 is an abundant number, since it is smaller than the sum of its proper divisors (4498560).

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

1889640 is a wasteful number, since it uses less digits than its factorization.

1889640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1889640 is about 1374.6417715172. The cubic root of 1889640 is about 123.6307084285.

The spelling of 1889640 in words is "one million, eight hundred eighty-nine thousand, six hundred forty".