1990851 has 8 divisors (see below), whose sum is σ = 2740224. Its totient is φ = 1284360.

The previous prime is 1990831. The next prime is 1990867. The reversal of 1990851 is 1580991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1990851 - 2⁶ = 1990787 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1990831) 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, 10611 + ... + 10796.

It is an arithmetic number, because the mean of its divisors is an integer number (342528).

2^1990851 is an apocalyptic number.

1990851 is a deficient number, since it is larger than the sum of its proper divisors (749373).

1990851 is a wasteful number, since it uses less digits than its factorization.

1990851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1990851 is about 1410.9751946792. The cubic root of 1990851 is about 125.7996943349.

The spelling of 1990851 in words is "one million, nine hundred ninety thousand, eight hundred fifty-one".