3728155 has 4 divisors (see below), whose sum is σ = 4473792. Its totient is φ = 2982520.

The previous prime is 3728149. The next prime is 3728173. The reversal of 3728155 is 5518273.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-3728155 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3728155 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372811 + ... + 372820.

It is an arithmetic number, because the mean of its divisors is an integer number (1118448).

Almost surely, 2^3728155 is an apocalyptic number.

3728155 is a deficient number, since it is larger than the sum of its proper divisors (745637).

3728155 is an equidigital number, since it uses as much as digits as its factorization.

3728155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745636.

The product of its digits is 8400, while the sum is 31.

The square root of 3728155 is about 1930.8430801078. The cubic root of 3728155 is about 155.0593598518.

It can be divided in two parts, 3728 and 155, that added together give a palindrome (3883).

The spelling of 3728155 in words is "three million, seven hundred twenty-eight thousand, one hundred fifty-five".