1897920 has 84 divisors (see below), whose sum is σ = 6537960. Its totient is φ = 505344.

The previous prime is 1897871. The next prime is 1897939. The reversal of 1897920 is 297981.

It is a happy number.

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 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 11 ways as a sum of consecutive naturals, for example, 2551 + ... + 3209.

2^1897920 is an apocalyptic number.

1897920 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 1897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3268980).

1897920 is an abundant number, since it is smaller than the sum of its proper divisors (4640040).

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

1897920 is a wasteful number, since it uses less digits than its factorization.

1897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1897920 is about 1377.6501733024. The cubic root of 1897920 is about 123.8110197997.

The spelling of 1897920 in words is "one million, eight hundred ninety-seven thousand, nine hundred twenty".