1897992 has 80 divisors (see below), whose sum is σ = 5553900. Its totient is φ = 604800.

The previous prime is 1897991. The next prime is 1898009. The reversal of 1897992 is 2997981.

It can be written as a sum of positive squares in 2 ways, for example, as 1726596 + 171396 = 1314^2 + 414^2 .

It is not an unprimeable number, because it can be changed into a prime (1897991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18742 + ... + 18842.

2^1897992 is an apocalyptic number.

1897992 is a gapful number since it is divisible by the number (12) 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 1897992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2776950).

1897992 is an abundant number, since it is smaller than the sum of its proper divisors (3655908).

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

1897992 is a wasteful number, since it uses less digits than its factorization.

1897992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 135 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1897992 is about 1377.6763045070. The cubic root of 1897992 is about 123.8125854226.

The spelling of 1897992 in words is "one million, eight hundred ninety-seven thousand, nine hundred ninety-two".