1990506 has 32 divisors (see below), whose sum is σ = 4612608. Its totient is φ = 560880.

The previous prime is 1990493. The next prime is 1990507. The reversal of 1990506 is 6050991.

It is a super-2 number, since 2×1990506² = 7924228272072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1990507) 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, 3201 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (144144).

2^1990506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2306304).

1990506 is an abundant number, since it is smaller than the sum of its proper divisors (2622102).

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

1990506 is a wasteful number, since it uses less digits than its factorization.

1990506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 1990506 is about 1410.8529335122. The cubic root of 1990506 is about 125.7924271911.

It can be divided in two parts, 19 and 90506, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 1990506 in words is "one million, nine hundred ninety thousand, five hundred six".