1587947 has 4 divisors (see below), whose sum is σ = 1624920. Its totient is φ = 1550976.

The previous prime is 1587923. The next prime is 1587959. The reversal of 1587947 is 7497851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7497851 = 449 ⋅16699.

It is a cyclic number.

It is not a de Polignac number, because 1587947 - 2¹² = 1583851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1587917) 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, 18422 + ... + 18507.

It is an arithmetic number, because the mean of its divisors is an integer number (406230).

2^1587947 is an apocalyptic number.

1587947 is a deficient number, since it is larger than the sum of its proper divisors (36973).

1587947 is an equidigital number, since it uses as much as digits as its factorization.

1587947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36972.

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

The square root of 1587947 is about 1260.1376908894. The cubic root of 1587947 is about 116.6662757357. Note that the first 3 decimals are identical.

The spelling of 1587947 in words is "one million, five hundred eighty-seven thousand, nine hundred forty-seven".