3491921 has 4 divisors (see below), whose sum is σ = 3495744. Its totient is φ = 3488100.

The previous prime is 3491899. The next prime is 3491923. The reversal of 3491921 is 1291943.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3491921 - 2⁶ = 3491857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3491923) 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, 356 + ... + 2666.

It is an arithmetic number, because the mean of its divisors is an integer number (873936).

Almost surely, 2^3491921 is an apocalyptic number.

It is an amenable number.

3491921 is a deficient number, since it is larger than the sum of its proper divisors (3823).

3491921 is a wasteful number, since it uses less digits than its factorization.

3491921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3822.

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

The square root of 3491921 is about 1868.6682423587. The cubic root of 3491921 is about 151.7125366765.

The spelling of 3491921 in words is "three million, four hundred ninety-one thousand, nine hundred twenty-one".