4991920 has 40 divisors (see below), whose sum is σ = 12115296. Its totient is φ = 1909248.

The previous prime is 4991893. The next prime is 4991923. The reversal of 4991920 is 291994.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (4991923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484 + ... + 3196.

Almost surely, 2^4991920 is an apocalyptic number.

4991920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4991920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6057648).

4991920 is an abundant number, since it is smaller than the sum of its proper divisors (7123376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4991920 is a wasteful number, since it uses less digits than its factorization.

4991920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 4991920 is about 2234.2605040595. The cubic root of 4991920 is about 170.9054343018.

The spelling of 4991920 in words is "four million, nine hundred ninety-one thousand, nine hundred twenty".