3928155 has 64 divisors (see below), whose sum is σ = 8294400. Its totient is φ = 1537920.

The previous prime is 3928151. The next prime is 3928157. The reversal of 3928155 is 5518293.

It is not a de Polignac number, because 3928155 - 2² = 3928151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

3928155 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21856 + ... + 22034.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

Almost surely, 2^3928155 is an apocalyptic number.

3928155 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3928155 is an abundant number, since it is smaller than the sum of its proper divisors (4366245).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3928155 is a wasteful number, since it uses less digits than its factorization.

3928155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224.

The product of its digits is 10800, while the sum is 33.

The square root of 3928155 is about 1981.9573658381. The cubic root of 3928155 is about 157.7839674260.

The spelling of 3928155 in words is "three million, nine hundred twenty-eight thousand, one hundred fifty-five".