3990681797 has 2 divisors, whose sum is σ = 3990681798. Its totient is φ = 3990681796.

The previous prime is 3990681791. The next prime is 3990681817. The reversal of 3990681797 is 7971860993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3984260641 + 6421156 = 63121^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 3990681797 - 2¹² = 3990677701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3990681791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995340898 + 1995340899.

It is an arithmetic number, because the mean of its divisors is an integer number (1995340899).

Almost surely, 2^3990681797 is an apocalyptic number.

It is an amenable number.

3990681797 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990681797 is an equidigital number, since it uses as much as digits as its factorization.

3990681797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The square root of 3990681797 is about 63171.8433876992. The cubic root of 3990681797 is about 1586.1674497884.

The spelling of 3990681797 in words is "three billion, nine hundred ninety million, six hundred eighty-one thousand, seven hundred ninety-seven".