3721913 has 4 divisors (see below), whose sum is σ = 4008228. Its totient is φ = 3435600.

The previous prime is 3721901. The next prime is 3721919. The reversal of 3721913 is 3191273.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1006009 + 2715904 = 1003^2 + 1648^2 .

It is a cyclic number.

It is not a de Polignac number, because 3721913 - 2⁶ = 3721849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143138 + ... + 143163.

It is an arithmetic number, because the mean of its divisors is an integer number (1002057).

Almost surely, 2^3721913 is an apocalyptic number.

It is an amenable number.

3721913 is a deficient number, since it is larger than the sum of its proper divisors (286315).

3721913 is a wasteful number, since it uses less digits than its factorization.

3721913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286314.

The product of its digits is 1134, while the sum is 26.

The square root of 3721913 is about 1929.2260106063. The cubic root of 3721913 is about 154.9727735737.

The spelling of 3721913 in words is "three million, seven hundred twenty-one thousand, nine hundred thirteen".