3975409 has 4 divisors (see below), whose sum is σ = 4103680. Its totient is φ = 3847140.

The previous prime is 3975383. The next prime is 3975437. The reversal of 3975409 is 9045793.

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 an emirpimes, since its reverse is a distinct semiprime: 9045793 = 673 ⋅13441.

It is a cyclic number.

It is not a de Polignac number, because 3975409 - 2⁷ = 3975281 is a prime.

It is a Duffinian number.

3975409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3975449) 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, 64089 + ... + 64150.

It is an arithmetic number, because the mean of its divisors is an integer number (1025920).

Almost surely, 2^3975409 is an apocalyptic number.

It is an amenable number.

3975409 is a deficient number, since it is larger than the sum of its proper divisors (128271).

3975409 is a wasteful number, since it uses less digits than its factorization.

3975409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128270.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 3975409 is about 1993.8427721363. The cubic root of 3975409 is about 158.4141381328.

The spelling of 3975409 in words is "three million, nine hundred seventy-five thousand, four hundred nine".