4989815 has 4 divisors (see below), whose sum is σ = 5987784. Its totient is φ = 3991848.

The previous prime is 4989811. The next prime is 4989821. The reversal of 4989815 is 5189894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5189894 = 2 ⋅2594947.

It is a cyclic number.

It is not a de Polignac number, because 4989815 - 2² = 4989811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4989811) 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, 498977 + ... + 498986.

It is an arithmetic number, because the mean of its divisors is an integer number (1496946).

Almost surely, 2^4989815 is an apocalyptic number.

4989815 is a deficient number, since it is larger than the sum of its proper divisors (997969).

4989815 is an equidigital number, since it uses as much as digits as its factorization.

4989815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997968.

The product of its digits is 103680, while the sum is 44.

The square root of 4989815 is about 2233.7893812981. The cubic root of 4989815 is about 170.8814083746.

The spelling of 4989815 in words is "four million, nine hundred eighty-nine thousand, eight hundred fifteen".