1987440 has 180 divisors, whose sum is σ = 7760664. Its totient is φ = 419328.

The previous prime is 1987439. The next prime is 1987451. The reversal of 1987440 is 447891.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 152874 + ... + 152886.

2^1987440 is an apocalyptic number.

1987440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3880332).

1987440 is an abundant number, since it is smaller than the sum of its proper divisors (5773224).

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

1987440 is a wasteful number, since it uses less digits than its factorization.

1987440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1987440 is about 1409.7659380195. The cubic root of 1987440 is about 125.7278074790.

The spelling of 1987440 in words is "one million, nine hundred eighty-seven thousand, four hundred forty".