4781989 has 2 divisors, whose sum is σ = 4781990. Its totient is φ = 4781988.

The previous prime is 4781983. The next prime is 4781993. The reversal of 4781989 is 9891874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3441025 + 1340964 = 1855^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 4781989 - 2²¹ = 2684837 is a prime.

It is a super-2 number, since 2×4781989² = 45734837592242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4781983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2390994 + 2390995.

It is an arithmetic number, because the mean of its divisors is an integer number (2390995).

Almost surely, 2^4781989 is an apocalyptic number.

It is an amenable number.

4781989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4781989 is an equidigital number, since it uses as much as digits as its factorization.

4781989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 4781989 is about 2186.7759373105. The cubic root of 4781989 is about 168.4752815898.

The spelling of 4781989 in words is "four million, seven hundred eighty-one thousand, nine hundred eighty-nine".