1987487 has 4 divisors (see below), whose sum is σ = 2104416. Its totient is φ = 1870560.

The previous prime is 1987483. The next prime is 1987501. The reversal of 1987487 is 7847891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7847891 = 109 ⋅71999.

It is a cyclic number.

It is not a de Polignac number, because 1987487 - 2² = 1987483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58439 + ... + 58472.

It is an arithmetic number, because the mean of its divisors is an integer number (526104).

2^1987487 is an apocalyptic number.

1987487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1987487 is a deficient number, since it is larger than the sum of its proper divisors (116929).

1987487 is a wasteful number, since it uses less digits than its factorization.

1987487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116928.

The product of its digits is 112896, while the sum is 44.

The square root of 1987487 is about 1409.7826073548. The cubic root of 1987487 is about 125.7287985631.

The spelling of 1987487 in words is "one million, nine hundred eighty-seven thousand, four hundred eighty-seven".