3931228 has 12 divisors (see below), whose sum is σ = 7862512. Its totient is φ = 1684800.

The previous prime is 3931177. The next prime is 3931231. The reversal of 3931228 is 8221393.

3931228 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 140401 = 3931228 / (3 + 9 + 3 + 1 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 3931196 and 3931205.

It is a congruent 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, 70173 + ... + 70228.

Almost surely, 2^3931228 is an apocalyptic number.

It is an amenable number.

3931228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3931228 is a wasteful number, since it uses less digits than its factorization.

3931228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140412 (or 140410 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 3931228 is about 1982.7324579983. The cubic root of 3931228 is about 157.8251015588.

It can be divided in two parts, 39312 and 28, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 3931228 in words is "three million, nine hundred thirty-one thousand, two hundred twenty-eight".