4721987 has 4 divisors (see below), whose sum is σ = 4759296. Its totient is φ = 4684680.

The previous prime is 4721963. The next prime is 4721999. The reversal of 4721987 is 7891274.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4721987 is a prime.

It is a super-2 number, since 2×4721987² = 44594322456338, which contains 22 as substring.

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 4721987.

It is not an unprimeable number, because it can be changed into a prime (4721957) 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, 18464 + ... + 18717.

It is an arithmetic number, because the mean of its divisors is an integer number (1189824).

Almost surely, 2^4721987 is an apocalyptic number.

4721987 is a deficient number, since it is larger than the sum of its proper divisors (37309).

4721987 is a wasteful number, since it uses less digits than its factorization.

4721987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37308.

The product of its digits is 28224, while the sum is 38.

The square root of 4721987 is about 2173.0133455642. The cubic root of 4721987 is about 167.7676658997.

The spelling of 4721987 in words is "four million, seven hundred twenty-one thousand, nine hundred eighty-seven".