3499721 has 2 divisors, whose sum is σ = 3499722. Its totient is φ = 3499720.

The previous prime is 3499711. The next prime is 3499757. The reversal of 3499721 is 1279943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3367225 + 132496 = 1835^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 3499721 - 2¹⁰ = 3498697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3499711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1749860 + 1749861.

It is an arithmetic number, because the mean of its divisors is an integer number (1749861).

Almost surely, 2^3499721 is an apocalyptic number.

It is an amenable number.

3499721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3499721 is an equidigital number, since it uses as much as digits as its factorization.

3499721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 3499721 is about 1870.7541260144. The cubic root of 3499721 is about 151.8254141612.

The spelling of 3499721 in words is "three million, four hundred ninety-nine thousand, seven hundred twenty-one".