1321887 has 16 divisors (see below), whose sum is σ = 2120960. Its totient is φ = 715392.

The previous prime is 1321867. The next prime is 1321891. The reversal of 1321887 is 7881231.

It is a happy number.

It is not a de Polignac number, because 1321887 - 2⁶ = 1321823 is a prime.

It is a super-3 number, since 3×1321887³ = 6929537501293233309, which contains 333 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321847) 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, 1258 + ... + 2055.

It is an arithmetic number, because the mean of its divisors is an integer number (132560).

2^1321887 is an apocalyptic number.

1321887 is a deficient number, since it is larger than the sum of its proper divisors (799073).

1321887 is a wasteful number, since it uses less digits than its factorization.

1321887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342.

The product of its digits is 2688, while the sum is 30.

The square root of 1321887 is about 1149.7334473694. The cubic root of 1321887 is about 109.7483780286.

The spelling of 1321887 in words is "one million, three hundred twenty-one thousand, eight hundred eighty-seven".