3977998397 has 2 divisors, whose sum is σ = 3977998398. Its totient is φ = 3977998396.

The previous prime is 3977998357. The next prime is 3977998439. The reversal of 3977998397 is 7938997793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3973285156 + 4713241 = 63034^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 3977998397 - 2¹² = 3977994301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3977998397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3977998357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1988999198 + 1988999199.

It is an arithmetic number, because the mean of its divisors is an integer number (1988999199).

Almost surely, 2^3977998397 is an apocalyptic number.

It is an amenable number.

3977998397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3977998397 is an equidigital number, since it uses as much as digits as its factorization.

3977998397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162030456, while the sum is 71.

The square root of 3977998397 is about 63071.3754170622. The cubic root of 3977998397 is about 1584.4852520808.

The spelling of 3977998397 in words is "three billion, nine hundred seventy-seven million, nine hundred ninety-eight thousand, three hundred ninety-seven".