1987826 has 4 divisors (see below), whose sum is σ = 2981742. Its totient is φ = 993912.

The previous prime is 1987819. The next prime is 1987829. The reversal of 1987826 is 6287891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6287891 = 37 ⋅169943.

It can be written as a sum of positive squares in only one way, i.e., 1957201 + 30625 = 1399^2 + 175^2 .

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496955 + ... + 496958.

2^1987826 is an apocalyptic number.

1987826 is a deficient number, since it is larger than the sum of its proper divisors (993916).

1987826 is an equidigital number, since it uses as much as digits as its factorization.

1987826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993915.

The product of its digits is 48384, while the sum is 41.

The square root of 1987826 is about 1409.9028335314. The cubic root of 1987826 is about 125.7359465578.

The spelling of 1987826 in words is "one million, nine hundred eighty-seven thousand, eight hundred twenty-six".