1987471 has 2 divisors, whose sum is σ = 1987472. Its totient is φ = 1987470.

The previous prime is 1987451. The next prime is 1987477. The reversal of 1987471 is 1747891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1747891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1987471 - 2⁵ = 1987439 is a prime.

It is a super-3 number, since 3×1987471³ = 23551775664887064333, which contains 333 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1987471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987477) 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 as a sum of consecutive naturals, namely, 993735 + 993736.

It is an arithmetic number, because the mean of its divisors is an integer number (993736).

2^1987471 is an apocalyptic number.

1987471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987471 is an equidigital number, since it uses as much as digits as its factorization.

1987471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 1987471 is about 1409.7769327096. The cubic root of 1987471 is about 125.7284611745.

The spelling of 1987471 in words is "one million, nine hundred eighty-seven thousand, four hundred seventy-one".