1987547 has 2 divisors, whose sum is σ = 1987548. Its totient is φ = 1987546.

The previous prime is 1987543. The next prime is 1987549. The reversal of 1987547 is 7457891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1987547 - 2² = 1987543 is a prime.

Together with 1987549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1987543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993773 + 993774.

It is an arithmetic number, because the mean of its divisors is an integer number (993774).

2^1987547 is an apocalyptic number.

1987547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987547 is an equidigital number, since it uses as much as digits as its factorization.

1987547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 1987547 is about 1409.8038870708. The cubic root of 1987547 is about 125.7300637541.

The spelling of 1987547 in words is "one million, nine hundred eighty-seven thousand, five hundred forty-seven".