1987149 has 8 divisors (see below), whose sum is σ = 2667040. Its totient is φ = 1316016.

The previous prime is 1987127. The next prime is 1987151. The reversal of 1987149 is 9417891.

It is a happy number.

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

It is not a de Polignac number, because 1987149 - 2⁸ = 1986893 is a prime.

It is a super-2 number, since 2×1987149² = 7897522296402, which contains 22 as substring.

It is a Duffinian number.

1987149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987189) 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 7 ways as a sum of consecutive naturals, for example, 1639 + ... + 2580.

It is an arithmetic number, because the mean of its divisors is an integer number (333380).

2^1987149 is an apocalyptic number.

It is an amenable number.

1987149 is a deficient number, since it is larger than the sum of its proper divisors (679891).

1987149 is a wasteful number, since it uses less digits than its factorization.

1987149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4379.

The product of its digits is 18144, while the sum is 39.

The square root of 1987149 is about 1409.6627256191. The cubic root of 1987149 is about 125.7216708447.

The spelling of 1987149 in words is "one million, nine hundred eighty-seven thousand, one hundred forty-nine".