3921961 has 4 divisors (see below), whose sum is σ = 4128400. Its totient is φ = 3715524.

The previous prime is 3921959. The next prime is 3921971. The reversal of 3921961 is 1691293.

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.

It is a cyclic number.

It is not a de Polignac number, because 3921961 - 2¹ = 3921959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921941) 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, 103191 + ... + 103228.

It is an arithmetic number, because the mean of its divisors is an integer number (1032100).

Almost surely, 2^3921961 is an apocalyptic number.

It is an amenable number.

3921961 is a deficient number, since it is larger than the sum of its proper divisors (206439).

3921961 is a wasteful number, since it uses less digits than its factorization.

3921961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206438.

The product of its digits is 2916, while the sum is 31.

The square root of 3921961 is about 1980.3941526878. The cubic root of 3921961 is about 157.7009914039.

The spelling of 3921961 in words is "three million, nine hundred twenty-one thousand, nine hundred sixty-one".