3721642 has 4 divisors (see below), whose sum is σ = 5582466. Its totient is φ = 1860820.

The previous prime is 3721631. The next prime is 3721673. The reversal of 3721642 is 2461273.

3721642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2461273 = 139 ⋅17707.

It can be written as a sum of positive squares in only one way, i.e., 3031081 + 690561 = 1741^2 + 831^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930409 + ... + 930412.

Almost surely, 2^3721642 is an apocalyptic number.

3721642 is a deficient number, since it is larger than the sum of its proper divisors (1860824).

3721642 is a wasteful number, since it uses less digits than its factorization.

3721642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860823.

The product of its digits is 2016, while the sum is 25.

The square root of 3721642 is about 1929.1557739073. The cubic root of 3721642 is about 154.9690121889.

The spelling of 3721642 in words is "three million, seven hundred twenty-one thousand, six hundred forty-two".