1881587 has 2 divisors, whose sum is σ = 1881588. Its totient is φ = 1881586.

The previous prime is 1881559. The next prime is 1881601. The reversal of 1881587 is 7851881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1881587 - 2¹⁴ = 1865203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1881587.

It is not a weakly prime, because it can be changed into another prime (1881787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940793 + 940794.

It is an arithmetic number, because the mean of its divisors is an integer number (940794).

2^1881587 is an apocalyptic number.

1881587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881587 is an equidigital number, since it uses as much as digits as its factorization.

1881587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 38.

The square root of 1881587 is about 1371.7095173542. The cubic root of 1881587 is about 123.4548344080.

The spelling of 1881587 in words is "one million, eight hundred eighty-one thousand, five hundred eighty-seven".