3748721 has 4 divisors (see below), whose sum is σ = 3969252. Its totient is φ = 3528192.

The previous prime is 3748711. The next prime is 3748733. The reversal of 3748721 is 1278473.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1278473 = 7 ⋅182639.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 790321 = 1720^2 + 889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3748721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3748711) 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, 110240 + ... + 110273.

It is an arithmetic number, because the mean of its divisors is an integer number (992313).

Almost surely, 2^3748721 is an apocalyptic number.

It is an amenable number.

3748721 is a deficient number, since it is larger than the sum of its proper divisors (220531).

3748721 is a wasteful number, since it uses less digits than its factorization.

3748721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220530.

The product of its digits is 9408, while the sum is 32.

The square root of 3748721 is about 1936.1614085608. The cubic root of 3748721 is about 155.3439603987.

The spelling of 3748721 in words is "three million, seven hundred forty-eight thousand, seven hundred twenty-one".