1987542 has 12 divisors (see below), whose sum is σ = 4306380. Its totient is φ = 662508.

The previous prime is 1987537. The next prime is 1987543. The reversal of 1987542 is 2457891.

It is a d-powerful number, because it can be written as 1 + 9³ + 8³ + 7³ + 5⁹ + 4³ + 2¹⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 1987497 and 1987506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987543) 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 5 ways as a sum of consecutive naturals, for example, 55192 + ... + 55227.

It is an arithmetic number, because the mean of its divisors is an integer number (358865).

2^1987542 is an apocalyptic number.

1987542 is an abundant number, since it is smaller than the sum of its proper divisors (2318838).

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

1987542 is a wasteful number, since it uses less digits than its factorization.

1987542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110427 (or 110424 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1987542 is about 1409.8021137734. The cubic root of 1987542 is about 125.7299583225.

The spelling of 1987542 in words is "one million, nine hundred eighty-seven thousand, five hundred forty-two".