1987774 has 4 divisors (see below), whose sum is σ = 2981664. Its totient is φ = 993886.

The previous prime is 1987709. The next prime is 1987789. The reversal of 1987774 is 4777891.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1987774.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 496942 + ... + 496945.

It is an arithmetic number, because the mean of its divisors is an integer number (745416).

2^1987774 is an apocalyptic number.

1987774 is a deficient number, since it is larger than the sum of its proper divisors (993890).

1987774 is an equidigital number, since it uses as much as digits as its factorization.

1987774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993889.

The product of its digits is 98784, while the sum is 43.

The square root of 1987774 is about 1409.8843924237. The cubic root of 1987774 is about 125.7348501630.

The spelling of 1987774 in words is "one million, nine hundred eighty-seven thousand, seven hundred seventy-four".