3961409 has 4 divisors (see below), whose sum is σ = 3966804. Its totient is φ = 3956016.

The previous prime is 3961393. The next prime is 3961411. The reversal of 3961409 is 9041693.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 2650384 = 1145^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 3961409 - 2⁴ = 3961393 is a prime.

It is a super-2 number, since 2×3961409² = 31385522530562, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961439) 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, 1382 + ... + 3135.

It is an arithmetic number, because the mean of its divisors is an integer number (991701).

Almost surely, 2^3961409 is an apocalyptic number.

It is an amenable number.

3961409 is a deficient number, since it is larger than the sum of its proper divisors (5395).

3961409 is an equidigital number, since it uses as much as digits as its factorization.

3961409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 3961409 is about 1990.3288672981. The cubic root of 3961409 is about 158.2279596813.

The spelling of 3961409 in words is "three million, nine hundred sixty-one thousand, four hundred nine".