3743921 has 4 divisors (see below), whose sum is σ = 3760500. Its totient is φ = 3727344.

The previous prime is 3743903. The next prime is 3743959. The reversal of 3743921 is 1293473.

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 2146225 + 1597696 = 1465^2 + 1264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3743921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3743981) 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, 7946 + ... + 8403.

It is an arithmetic number, because the mean of its divisors is an integer number (940125).

Almost surely, 2^3743921 is an apocalyptic number.

It is an amenable number.

3743921 is a deficient number, since it is larger than the sum of its proper divisors (16579).

3743921 is a wasteful number, since it uses less digits than its factorization.

3743921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578.

The product of its digits is 4536, while the sum is 29.

The square root of 3743921 is about 1934.9214454339. The cubic root of 3743921 is about 155.2776293763.

It can be divided in two parts, 3743 and 921, that added together give a palindrome (4664).

The spelling of 3743921 in words is "three million, seven hundred forty-three thousand, nine hundred twenty-one".