4991894 has 4 divisors (see below), whose sum is σ = 7487844. Its totient is φ = 2495946.

The previous prime is 4991893. The next prime is 4991923. The reversal of 4991894 is 4981994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4981994 = 2 ⋅2490997.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1247972 + ... + 1247975.

It is an arithmetic number, because the mean of its divisors is an integer number (1871961).

Almost surely, 2^4991894 is an apocalyptic number.

4991894 is a deficient number, since it is larger than the sum of its proper divisors (2495950).

4991894 is a wasteful number, since it uses less digits than its factorization.

4991894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495949.

The product of its digits is 93312, while the sum is 44.

The square root of 4991894 is about 2234.2546855719. The cubic root of 4991894 is about 170.9051375857.

It can be divided in two parts, 4991 and 894, that added together give a palindrome (5885).

The spelling of 4991894 in words is "four million, nine hundred ninety-one thousand, eight hundred ninety-four".