3729721 has 2 divisors, whose sum is σ = 3729722. Its totient is φ = 3729720.

The previous prime is 3729709. The next prime is 3729727. The reversal of 3729721 is 1279273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3024121 + 705600 = 1739^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 3729721 - 2²¹ = 1632569 is a prime.

It is not a weakly prime, because it can be changed into another prime (3729727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864860 + 1864861.

It is an arithmetic number, because the mean of its divisors is an integer number (1864861).

Almost surely, 2^3729721 is an apocalyptic number.

It is an amenable number.

3729721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3729721 is an equidigital number, since it uses as much as digits as its factorization.

3729721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 31.

The square root of 3729721 is about 1931.2485598700. The cubic root of 3729721 is about 155.0810675479.

The spelling of 3729721 in words is "three million, seven hundred twenty-nine thousand, seven hundred twenty-one".