3921491 has 4 divisors (see below), whose sum is σ = 4481712. Its totient is φ = 3361272.

The previous prime is 3921451. The next prime is 3921497. The reversal of 3921491 is 1941293.

3921491 = T₁₀₅₅ + T₁₀₅₆ + ... + T₁₀₆₁.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3921491 - 2¹⁰ = 3920467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280100 + ... + 280113.

It is an arithmetic number, because the mean of its divisors is an integer number (1120428).

Almost surely, 2^3921491 is an apocalyptic number.

3921491 is a deficient number, since it is larger than the sum of its proper divisors (560221).

3921491 is an equidigital number, since it uses as much as digits as its factorization.

3921491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560220.

The product of its digits is 1944, while the sum is 29.

The square root of 3921491 is about 1980.2754858857. The cubic root of 3921491 is about 157.6946916280.

The spelling of 3921491 in words is "three million, nine hundred twenty-one thousand, four hundred ninety-one".