1987788 has 54 divisors (see below), whose sum is σ = 5239668. Its totient is φ = 586080.

The previous prime is 1987709. The next prime is 1987789. The reversal of 1987788 is 8877891.

It is a super-2 number, since 2×1987788² = 7902602265888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1987789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 53706 + ... + 53742.

2^1987788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2619834).

1987788 is an abundant number, since it is smaller than the sum of its proper divisors (3251880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1987788 is a wasteful number, since it uses less digits than its factorization.

1987788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 53 counting only the distinct ones).

The product of its digits is 225792, while the sum is 48.

The square root of 1987788 is about 1409.8893573611. The cubic root of 1987788 is about 125.7351453481.

Multiplying 1987788 by its sum of digits (48), we get a square (95413824 = 9768²).

It can be divided in two parts, 1987 and 788, that added together give a triangular number (2775 = T₇₄).

The spelling of 1987788 in words is "one million, nine hundred eighty-seven thousand, seven hundred eighty-eight".