3948509 has 4 divisors (see below), whose sum is σ = 3952704. Its totient is φ = 3944316.

The previous prime is 3948493. The next prime is 3948521. The reversal of 3948509 is 9058493.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9058493 = 1951 ⋅4643.

It is a cyclic number.

It is not a de Polignac number, because 3948509 - 2⁴ = 3948493 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 (3948569) 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, 44 + ... + 2810.

It is an arithmetic number, because the mean of its divisors is an integer number (988176).

Almost surely, 2^3948509 is an apocalyptic number.

It is an amenable number.

3948509 is a deficient number, since it is larger than the sum of its proper divisors (4195).

3948509 is a wasteful number, since it uses less digits than its factorization.

3948509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 3948509 is about 1987.0855542729. The cubic root of 3948509 is about 158.0560208334.

The spelling of 3948509 in words is "three million, nine hundred forty-eight thousand, five hundred nine".