1975820 has 48 divisors (see below), whose sum is σ = 5177088. Its totient is φ = 615360.

The previous prime is 1975819. The next prime is 1975823. The reversal of 1975820 is 285791.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1975823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899 + ... + 2181.

It is an arithmetic number, because the mean of its divisors is an integer number (107856).

2^1975820 is an apocalyptic number.

1975820 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 1975820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2588544).

1975820 is an abundant number, since it is smaller than the sum of its proper divisors (3201268).

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

1975820 is a wasteful number, since it uses less digits than its factorization.

1975820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1975820 is about 1405.6386448871. The cubic root of 1975820 is about 125.4822967256.

The spelling of 1975820 in words is "one million, nine hundred seventy-five thousand, eight hundred twenty".