1587989 has 16 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 1360128.

The previous prime is 1587977. The next prime is 1587991. The reversal of 1587989 is 9897851.

It is a happy number.

It is not a de Polignac number, because 1587989 - 2⁴ = 1587973 is a prime.

It is a super-3 number, since 3×1587989³ = 12013338765073328007, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13997 + ... + 14109.

It is an arithmetic number, because the mean of its divisors is an integer number (114912).

2^1587989 is an apocalyptic number.

It is an amenable number.

1587989 is a deficient number, since it is larger than the sum of its proper divisors (250603).

1587989 is a wasteful number, since it uses less digits than its factorization.

1587989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its digits is 181440, while the sum is 47.

The square root of 1587989 is about 1260.1543556247. The cubic root of 1587989 is about 116.6673043049.

The spelling of 1587989 in words is "one million, five hundred eighty-seven thousand, nine hundred eighty-nine".