1990887 has 16 divisors (see below), whose sum is σ = 2845440. Its totient is φ = 1233792.

The previous prime is 1990883. The next prime is 1990889. The reversal of 1990887 is 7880991.

It is not a de Polignac number, because 1990887 - 2² = 1990883 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990883) 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, 5064 + ... + 5442.

It is an arithmetic number, because the mean of its divisors is an integer number (177840).

2^1990887 is an apocalyptic number.

1990887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1990887 is a deficient number, since it is larger than the sum of its proper divisors (854553).

1990887 is a wasteful number, since it uses less digits than its factorization.

1990887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1990887 is about 1410.9879517558. The cubic root of 1990887 is about 125.8004525972.

The spelling of 1990887 in words is "one million, nine hundred ninety thousand, eight hundred eighty-seven".