4721989 has 4 divisors (see below), whose sum is σ = 4765420. Its totient is φ = 4678560.

The previous prime is 4721963. The next prime is 4721999. The reversal of 4721989 is 9891274.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3771364 + 950625 = 1942^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 4721989 - 2⁵ = 4721957 is a prime.

It is a super-2 number, since 2×4721989² = 44594360232242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4721999) 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, 21552 + ... + 21769.

It is an arithmetic number, because the mean of its divisors is an integer number (1191355).

Almost surely, 2^4721989 is an apocalyptic number.

It is an amenable number.

4721989 is a deficient number, since it is larger than the sum of its proper divisors (43431).

4721989 is a wasteful number, since it uses less digits than its factorization.

4721989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43430.

The product of its digits is 36288, while the sum is 40.

The square root of 4721989 is about 2173.0138057546. The cubic root of 4721989 is about 167.7676895857.

The spelling of 4721989 in words is "four million, seven hundred twenty-one thousand, nine hundred eighty-nine".