3921490 has 8 divisors (see below), whose sum is σ = 7058700. Its totient is φ = 1568592.

The previous prime is 3921451. The next prime is 3921497. The reversal of 3921490 is 941293.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3853369 + 68121 = 1963^2 + 261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3921497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196065 + ... + 196084.

Almost surely, 2^3921490 is an apocalyptic number.

3921490 is a deficient number, since it is larger than the sum of its proper divisors (3137210).

3921490 is a wasteful number, since it uses less digits than its factorization.

3921490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392156.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3921490 is about 1980.2752333956. The cubic root of 3921490 is about 157.6946782236.

It can be divided in two parts, 39214 and 90, that added together give a cube (39304 = 34³).

The spelling of 3921490 in words is "three million, nine hundred twenty-one thousand, four hundred ninety".