4991906 has 8 divisors (see below), whose sum is σ = 7502124. Its totient is φ = 2491200.

The previous prime is 4991893. The next prime is 4991923. The reversal of 4991906 is 6091994.

It can be written as a sum of positive squares in 2 ways, for example, as 4879681 + 112225 = 2209^2 + 335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 4991906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875 + ... + 3278.

Almost surely, 2^4991906 is an apocalyptic number.

4991906 is a deficient number, since it is larger than the sum of its proper divisors (2510218).

4991906 is a wasteful number, since it uses less digits than its factorization.

4991906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 4991906 is about 2234.2573710296. The cubic root of 4991906 is about 170.9052745317.

The spelling of 4991906 in words is "four million, nine hundred ninety-one thousand, nine hundred six".