3728257 has 4 divisors (see below), whose sum is σ = 4015060. Its totient is φ = 3441456.

The previous prime is 3728251. The next prime is 3728267. The reversal of 3728257 is 7528273.

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 190096 + 3538161 = 436^2 + 1881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3728257 is a prime.

It is a Duffinian number.

3728257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3728251) 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, 143382 + ... + 143407.

It is an arithmetic number, because the mean of its divisors is an integer number (1003765).

Almost surely, 2^3728257 is an apocalyptic number.

It is an amenable number.

3728257 is a deficient number, since it is larger than the sum of its proper divisors (286803).

3728257 is a wasteful number, since it uses less digits than its factorization.

3728257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286802.

The product of its digits is 23520, while the sum is 34.

The square root of 3728257 is about 1930.8694932594. The cubic root of 3728257 is about 155.0607739481.

The spelling of 3728257 in words is "three million, seven hundred twenty-eight thousand, two hundred fifty-seven".