3901891 has 8 divisors (see below), whose sum is σ = 4721760. Its totient is φ = 3147648.

The previous prime is 3901871. The next prime is 3901901. The reversal of 3901891 is 1981093.

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

It is not a de Polignac number, because 3901891 - 2¹¹ = 3899843 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3901801) 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, 16276 + ... + 16513.

It is an arithmetic number, because the mean of its divisors is an integer number (590220).

Almost surely, 2^3901891 is an apocalyptic number.

3901891 is a deficient number, since it is larger than the sum of its proper divisors (819869).

3901891 is a wasteful number, since it uses less digits than its factorization.

3901891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32813.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 3901891 is about 1975.3204803272. The cubic root of 3901891 is about 157.4315281438.

The spelling of 3901891 in words is "three million, nine hundred one thousand, eight hundred ninety-one".