3897902221 has 2 divisors, whose sum is σ = 3897902222. Its totient is φ = 3897902220.

The previous prime is 3897902167. The next prime is 3897902287. The reversal of 3897902221 is 1222097983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2238236100 + 1659666121 = 47310^2 + 40739^2 .

It is an emirp because it is prime and its reverse (1222097983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3897902221 - 2²³ = 3889513613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3897902291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1948951110 + 1948951111.

It is an arithmetic number, because the mean of its divisors is an integer number (1948951111).

Almost surely, 2^3897902221 is an apocalyptic number.

It is an amenable number.

3897902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3897902221 is an equidigital number, since it uses as much as digits as its factorization.

3897902221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 3897902221 is about 62433.1820508934. The cubic root of 3897902221 is about 1573.7786410624.

The spelling of 3897902221 in words is "three billion, eight hundred ninety-seven million, nine hundred two thousand, two hundred twenty-one".