3970406221 has 2 divisors, whose sum is σ = 3970406222. Its totient is φ = 3970406220.

The previous prime is 3970406203. The next prime is 3970406243. The reversal of 3970406221 is 1226040793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3808124100 + 162282121 = 61710^2 + 12739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3970406221 is a prime.

It is a super-3 number, since 3×3970406221³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3970406261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985203110 + 1985203111.

It is an arithmetic number, because the mean of its divisors is an integer number (1985203111).

Almost surely, 2^3970406221 is an apocalyptic number.

It is an amenable number.

3970406221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3970406221 is an equidigital number, since it uses as much as digits as its factorization.

3970406221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 3970406221 is about 63011.1594957592. The cubic root of 3970406221 is about 1583.4765913690.

The spelling of 3970406221 in words is "three billion, nine hundred seventy million, four hundred six thousand, two hundred twenty-one".