1588991 has 4 divisors (see below), whose sum is σ = 1610832. Its totient is φ = 1567152.

The previous prime is 1588987. The next prime is 1589017. The reversal of 1588991 is 1998851.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1588991 - 2² = 1588987 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 (1588901) 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, 10811 + ... + 10956.

It is an arithmetic number, because the mean of its divisors is an integer number (402708).

2^1588991 is an apocalyptic number.

1588991 is a deficient number, since it is larger than the sum of its proper divisors (21841).

1588991 is an equidigital number, since it uses as much as digits as its factorization.

1588991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21840.

The product of its digits is 25920, while the sum is 41.

The square root of 1588991 is about 1260.5518632726. The cubic root of 1588991 is about 116.6918376528.

The spelling of 1588991 in words is "one million, five hundred eighty-eight thousand, nine hundred ninety-one".