3728405 has 8 divisors (see below), whose sum is σ = 4531200. Its totient is φ = 2944656.

The previous prime is 3728393. The next prime is 3728407. The reversal of 3728405 is 5048273.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3728405 - 2⁸ = 3728149 is a prime.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4325 + ... + 5114.

It is an arithmetic number, because the mean of its divisors is an integer number (566400).

Almost surely, 2^3728405 is an apocalyptic number.

It is an amenable number.

3728405 is a deficient number, since it is larger than the sum of its proper divisors (802795).

3728405 is an equidigital number, since it uses as much as digits as its factorization.

3728405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9523.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 3728405 is about 1930.9078175822. The cubic root of 3728405 is about 155.0628257282.

The spelling of 3728405 in words is "three million, seven hundred twenty-eight thousand, four hundred five".