3438373721 has 2 divisors, whose sum is σ = 3438373722. Its totient is φ = 3438373720.

The previous prime is 3438373667. The next prime is 3438373733. The reversal of 3438373721 is 1273738343.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3433374025 + 4999696 = 58595^2 + 2236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3438373721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3438373121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1719186860 + 1719186861.

It is an arithmetic number, because the mean of its divisors is an integer number (1719186861).

Almost surely, 2^3438373721 is an apocalyptic number.

It is an amenable number.

3438373721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3438373721 is an equidigital number, since it uses as much as digits as its factorization.

3438373721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 41.

The square root of 3438373721 is about 58637.6476421079. The cubic root of 3438373721 is about 1509.3305397509.

The spelling of 3438373721 in words is "three billion, four hundred thirty-eight million, three hundred seventy-three thousand, seven hundred twenty-one".