1990578 has 16 divisors (see below), whose sum is σ = 4021056. Its totient is φ = 656880.

The previous prime is 1990577. The next prime is 1990579. The reversal of 1990578 is 8750991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1990577) and next prime (1990579).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1990577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 993 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (251316).

2^1990578 is an apocalyptic number.

1990578 is an abundant number, since it is smaller than the sum of its proper divisors (2030478).

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

1990578 is a wasteful number, since it uses less digits than its factorization.

1990578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329.

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

The square root of 1990578 is about 1410.8784497610. The cubic root of 1990578 is about 125.7939438818.

The spelling of 1990578 in words is "one million, nine hundred ninety thousand, five hundred seventy-eight".