3728409 has 4 divisors (see below), whose sum is σ = 4971216. Its totient is φ = 2485604.

The previous prime is 3728407. The next prime is 3728411. The reversal of 3728409 is 9048273.

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 an interprime number because it is at equal distance from previous prime (3728407) and next prime (3728411).

It is a cyclic number.

It is not a de Polignac number, because 3728409 - 2¹ = 3728407 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 3728409.

It is not an unprimeable number, because it can be changed into a prime (3728407) 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, 621399 + ... + 621404.

It is an arithmetic number, because the mean of its divisors is an integer number (1242804).

Almost surely, 2^3728409 is an apocalyptic number.

It is an amenable number.

3728409 is a deficient number, since it is larger than the sum of its proper divisors (1242807).

3728409 is a wasteful number, since it uses less digits than its factorization.

3728409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242806.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 3728409 is about 1930.9088533641. The cubic root of 3728409 is about 155.0628811810.

The spelling of 3728409 in words is "three million, seven hundred twenty-eight thousand, four hundred nine".