4989781 has 4 divisors (see below), whose sum is σ = 5206752. Its totient is φ = 4772812.

The previous prime is 4989779. The next prime is 4989797. The reversal of 4989781 is 1879894.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4989781 - 2¹ = 4989779 is a prime.

It is a super-2 number, since 2×4989781² = 49795828855922, 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 (4989701) 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, 108451 + ... + 108496.

It is an arithmetic number, because the mean of its divisors is an integer number (1301688).

Almost surely, 2^4989781 is an apocalyptic number.

It is an amenable number.

4989781 is a deficient number, since it is larger than the sum of its proper divisors (216971).

4989781 is a wasteful number, since it uses less digits than its factorization.

4989781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216970.

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

The square root of 4989781 is about 2233.7817708988. The cubic root of 4989781 is about 170.8810202520.

The spelling of 4989781 in words is "four million, nine hundred eighty-nine thousand, seven hundred eighty-one".