4891863 has 4 divisors (see below), whose sum is σ = 6522488. Its totient is φ = 3261240.

The previous prime is 4891853. The next prime is 4891879. The reversal of 4891863 is 3681984.

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

It is not a de Polignac number, because 4891863 - 2¹⁸ = 4629719 is a prime.

It is a super-2 number, since 2×4891863² = 47860647221538, which contains 22 as substring.

It is a D-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 (4891823) 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, 815308 + ... + 815313.

It is an arithmetic number, because the mean of its divisors is an integer number (1630622).

Almost surely, 2^4891863 is an apocalyptic number.

4891863 is a deficient number, since it is larger than the sum of its proper divisors (1630625).

4891863 is a wasteful number, since it uses less digits than its factorization.

4891863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630624.

The product of its digits is 41472, while the sum is 39.

The square root of 4891863 is about 2211.7556374971. The cubic root of 4891863 is about 169.7558548449.

The spelling of 4891863 in words is "four million, eight hundred ninety-one thousand, eight hundred sixty-three".