3696394021 has 2 divisors, whose sum is σ = 3696394022. Its totient is φ = 3696394020.

The previous prime is 3696394019. The next prime is 3696394049. The reversal of 3696394021 is 1204936963.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3238861921 + 457532100 = 56911^2 + 21390^2 .

It is a cyclic number.

It is not a de Polignac number, because 3696394021 - 2¹ = 3696394019 is a prime.

Together with 3696394019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3696394001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1848197010 + 1848197011.

It is an arithmetic number, because the mean of its divisors is an integer number (1848197011).

Almost surely, 2^3696394021 is an apocalyptic number.

It is an amenable number.

3696394021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3696394021 is an equidigital number, since it uses as much as digits as its factorization.

3696394021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 3696394021 is about 60797.9771127297. The cubic root of 3696394021 is about 1546.1777512688.

The spelling of 3696394021 in words is "three billion, six hundred ninety-six million, three hundred ninety-four thousand, twenty-one".