4091920 has 40 divisors (see below), whose sum is σ = 10874304. Its totient is φ = 1402752.

The previous prime is 4091911. The next prime is 4091921. The reversal of 4091920 is 291904.

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 (4091921) 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, 3094 + ... + 4213.

Almost surely, 2^4091920 is an apocalyptic number.

4091920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4091920 is an abundant number, since it is smaller than the sum of its proper divisors (6782384).

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

4091920 is a wasteful number, since it uses less digits than its factorization.

4091920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327 (or 7321 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 4091920 is about 2022.8494753688. The cubic root of 4091920 is about 159.9468573511.

The spelling of 4091920 in words is "four million, ninety-one thousand, nine hundred twenty".