1987822 has 8 divisors (see below), whose sum is σ = 2995776. Its totient is φ = 989232.

The previous prime is 1987819. The next prime is 1987829. The reversal of 1987822 is 2287891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1783 + ... + 2674.

It is an arithmetic number, because the mean of its divisors is an integer number (374472).

2^1987822 is an apocalyptic number.

1987822 is the 892-nd heptagonal number.

1987822 is a deficient number, since it is larger than the sum of its proper divisors (1007954).

1987822 is a wasteful number, since it uses less digits than its factorization.

1987822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682.

The product of its digits is 16128, while the sum is 37.

The square root of 1987822 is about 1409.9014149933. The cubic root of 1987822 is about 125.7358622204.

It can be divided in two parts, 19878 and 22, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1987822 in words is "one million, nine hundred eighty-seven thousand, eight hundred twenty-two".