5621987 has 4 divisors (see below), whose sum is σ = 6425136. Its totient is φ = 4818840.

The previous prime is 5621983. The next prime is 5621989. The reversal of 5621987 is 7891265.

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 5621987 - 2² = 5621983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5621987.

It is not an unprimeable number, because it can be changed into a prime (5621983) 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, 401564 + ... + 401577.

It is an arithmetic number, because the mean of its divisors is an integer number (1606284).

Almost surely, 2^5621987 is an apocalyptic number.

5621987 is a deficient number, since it is larger than the sum of its proper divisors (803149).

5621987 is an equidigital number, since it uses as much as digits as its factorization.

5621987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803148.

The product of its digits is 30240, while the sum is 38.

The square root of 5621987 is about 2371.0729638710. The cubic root of 5621987 is about 177.8129057176.

The spelling of 5621987 in words is "five million, six hundred twenty-one thousand, nine hundred eighty-seven".