3728931 has 4 divisors (see below), whose sum is σ = 4971912. Its totient is φ = 2485952.

The previous prime is 3728911. The next prime is 3728939. The reversal of 3728931 is 1398273.

3728931 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: 1398273 = 3 ⋅466091.

It is a cyclic number.

It is not a de Polignac number, because 3728931 - 2⁶ = 3728867 is a prime.

It is a super-3 number, since 3×3728931³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

3728931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3728892 and 3728901.

It is not an unprimeable number, because it can be changed into a prime (3728939) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 621486 + ... + 621491.

It is an arithmetic number, because the mean of its divisors is an integer number (1242978).

Almost surely, 2^3728931 is an apocalyptic number.

3728931 is a deficient number, since it is larger than the sum of its proper divisors (1242981).

3728931 is a wasteful number, since it uses less digits than its factorization.

3728931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242980.

The product of its digits is 9072, while the sum is 33.

The square root of 3728931 is about 1931.0440181415. The cubic root of 3728931 is about 155.0701174264.

The spelling of 3728931 in words is "three million, seven hundred twenty-eight thousand, nine hundred thirty-one".