3728365 has 4 divisors (see below), whose sum is σ = 4474044. Its totient is φ = 2982688.

The previous prime is 3728363. The next prime is 3728371. The reversal of 3728365 is 5638273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5638273 = 83 ⋅67931.

It can be written as a sum of positive squares in 2 ways, for example, as 2350089 + 1378276 = 1533^2 + 1174^2 .

It is a cyclic number.

It is not a de Polignac number, because 3728365 - 2¹ = 3728363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3728365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728363) 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, 372832 + ... + 372841.

It is an arithmetic number, because the mean of its divisors is an integer number (1118511).

Almost surely, 2^3728365 is an apocalyptic number.

It is an amenable number.

3728365 is a deficient number, since it is larger than the sum of its proper divisors (745679).

3728365 is an equidigital number, since it uses as much as digits as its factorization.

3728365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745678.

The product of its digits is 30240, while the sum is 34.

The square root of 3728365 is about 1930.8974597321. The cubic root of 3728365 is about 155.0622711984.

It can be divided in two parts, 3 and 728365, that multiplied together give a triangular number (2185095 = T₂₀₉₀).

The spelling of 3728365 in words is "three million, seven hundred twenty-eight thousand, three hundred sixty-five".