7985379397 has 2 divisors, whose sum is σ = 7985379398. Its totient is φ = 7985379396.

The previous prime is 7985379359. The next prime is 7985379401. The reversal of 7985379397 is 7939735897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7900720996 + 84658401 = 88886^2 + 9201^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7985379397 is a prime.

It is a super-2 number, since 2×7985379397² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7985379097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992689698 + 3992689699.

It is an arithmetic number, because the mean of its divisors is an integer number (3992689699).

Almost surely, 2^7985379397 is an apocalyptic number.

It is an amenable number.

7985379397 is a deficient number, since it is larger than the sum of its proper divisors (1).

7985379397 is an equidigital number, since it uses as much as digits as its factorization.

7985379397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90016920, while the sum is 67.

The square root of 7985379397 is about 89360.9500676890. The cubic root of 7985379397 is about 1998.7808734329.

The spelling of 7985379397 in words is "seven billion, nine hundred eighty-five million, three hundred seventy-nine thousand, three hundred ninety-seven".