3491728 has 10 divisors (see below), whose sum is σ = 6765254. Its totient is φ = 1745856.

The previous prime is 3491723. The next prime is 3491743. The reversal of 3491728 is 8271943.

It can be written as a sum of positive squares in only one way, i.e., 3489424 + 2304 = 1868^2 + 48^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3491693 and 3491702.

It is not an unprimeable number, because it can be changed into a prime (3491723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109101 + ... + 109132.

Almost surely, 2^3491728 is an apocalyptic number.

It is an amenable number.

3491728 is a deficient number, since it is larger than the sum of its proper divisors (3273526).

3491728 is a wasteful number, since it uses less digits than its factorization.

3491728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218241 (or 218235 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 3491728 is about 1868.6166005899. The cubic root of 3491728 is about 151.7097415522.

The spelling of 3491728 in words is "three million, four hundred ninety-one thousand, seven hundred twenty-eight".