3421991 has 4 divisors (see below), whose sum is σ = 3431400. Its totient is φ = 3412584.

The previous prime is 3421939. The next prime is 3421993. The reversal of 3421991 is 1991243.

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 3421991 - 2⁶ = 3421927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3421993) 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, 4136 + ... + 4893.

It is an arithmetic number, because the mean of its divisors is an integer number (857850).

Almost surely, 2^3421991 is an apocalyptic number.

3421991 is a deficient number, since it is larger than the sum of its proper divisors (9409).

3421991 is an equidigital number, since it uses as much as digits as its factorization.

3421991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9408.

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

The square root of 3421991 is about 1849.8624273172. The cubic root of 3421991 is about 150.6929567727.

The spelling of 3421991 in words is "three million, four hundred twenty-one thousand, nine hundred ninety-one".