3720891 has 8 divisors (see below), whose sum is σ = 4997440. Its totient is φ = 2462472.

The previous prime is 3720889. The next prime is 3720907. The reversal of 3720891 is 1980273.

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 3720891 - 2¹ = 3720889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3720811) 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, 4045 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (624680).

Almost surely, 2^3720891 is an apocalyptic number.

3720891 is a deficient number, since it is larger than the sum of its proper divisors (1276549).

3720891 is a wasteful number, since it uses less digits than its factorization.

3720891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9065.

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

The square root of 3720891 is about 1928.9611193593. The cubic root of 3720891 is about 154.9585876185.

The spelling of 3720891 in words is "three million, seven hundred twenty thousand, eight hundred ninety-one".