1987138 has 8 divisors (see below), whose sum is σ = 3083580. Its totient is φ = 959280.

The previous prime is 1987127. The next prime is 1987151. The reversal of 1987138 is 8317891.

It can be written as a sum of positive squares in 2 ways, for example, as 1723969 + 263169 = 1313^2 + 513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1987097 and 1987106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17073 + ... + 17188.

2^1987138 is an apocalyptic number.

1987138 is a deficient number, since it is larger than the sum of its proper divisors (1096442).

1987138 is a wasteful number, since it uses less digits than its factorization.

1987138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34292.

The product of its digits is 12096, while the sum is 37.

The square root of 1987138 is about 1409.6588239712. The cubic root of 1987138 is about 125.7214388639.

The spelling of 1987138 in words is "one million, nine hundred eighty-seven thousand, one hundred thirty-eight".