1987938 has 12 divisors (see below), whose sum is σ = 4307238. Its totient is φ = 662640.

The previous prime is 1987919. The next prime is 1987939. The reversal of 1987938 is 8397891.

It can be written as a sum of positive squares in only one way, i.e., 1896129 + 91809 = 1377^2 + 303^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1987893 and 1987902.

It is not an unprimeable number, because it can be changed into a prime (1987939) 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 5 ways as a sum of consecutive naturals, for example, 55203 + ... + 55238.

2^1987938 is an apocalyptic number.

1987938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1987938 is an abundant number, since it is smaller than the sum of its proper divisors (2319300).

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

1987938 is a wasteful number, since it uses less digits than its factorization.

1987938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110449 (or 110446 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1987938 is about 1409.9425520212. The cubic root of 1987938 is about 125.7383079586.

The spelling of 1987938 in words is "one million, nine hundred eighty-seven thousand, nine hundred thirty-eight".