1997850 has 48 divisors (see below), whose sum is σ = 5222880. Its totient is φ = 504000.

The previous prime is 1997843. The next prime is 1997851. The reversal of 1997850 is 587991.

It is a happy number.

1997850 is a Rhonda number in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1997799 and 1997808.

It is not an unprimeable number, because it can be changed into a prime (1997851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2500 + ... + 3200.

It is an arithmetic number, because the mean of its divisors is an integer number (108810).

2^1997850 is an apocalyptic number.

1997850 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 1997850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2611440).

1997850 is an abundant number, since it is smaller than the sum of its proper divisors (3225030).

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

1997850 is a wasteful number, since it uses less digits than its factorization.

1997850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 1997850 is about 1413.4532181859. The cubic root of 1997850 is about 125.9469416311.

The spelling of 1997850 in words is "one million, nine hundred ninety-seven thousand, eight hundred fifty".