3736721 has 4 divisors (see below), whose sum is σ = 3766272. Its totient is φ = 3707172.

The previous prime is 3736717. The next prime is 3736723. The reversal of 3736721 is 1276373.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1276373 = 7 ⋅182339.

It is a cyclic number.

It is not a de Polignac number, because 3736721 - 2² = 3736717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3736723) 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, 14585 + ... + 14838.

It is an arithmetic number, because the mean of its divisors is an integer number (941568).

Almost surely, 2^3736721 is an apocalyptic number.

It is an amenable number.

3736721 is a deficient number, since it is larger than the sum of its proper divisors (29551).

3736721 is a wasteful number, since it uses less digits than its factorization.

3736721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29550.

The product of its digits is 5292, while the sum is 29.

The square root of 3736721 is about 1933.0600094151. The cubic root of 3736721 is about 155.1780264574.

The spelling of 3736721 in words is "three million, seven hundred thirty-six thousand, seven hundred twenty-one".