3728091 has 8 divisors (see below), whose sum is σ = 5131264. Its totient is φ = 2405160.

The previous prime is 3728069. The next prime is 3728099. The reversal of 3728091 is 1908273.

It is a happy number.

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

It is not a de Polignac number, because 3728091 - 2⁹ = 3727579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3728099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19951 + ... + 20136.

It is an arithmetic number, because the mean of its divisors is an integer number (641408).

Almost surely, 2^3728091 is an apocalyptic number.

3728091 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3728091 is a deficient number, since it is larger than the sum of its proper divisors (1403173).

3728091 is a wasteful number, since it uses less digits than its factorization.

3728091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40121.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3728091 is about 1930.8265069653. The cubic root of 3728091 is about 155.0584725626.

The spelling of 3728091 in words is "three million, seven hundred twenty-eight thousand, ninety-one".