3656215397 has 16 divisors (see below), whose sum is σ = 3816720000. Its totient is φ = 3498129600.

The previous prime is 3656215379. The next prime is 3656215403. The reversal of 3656215397 is 7935126563.

It is a cyclic number.

It is not a de Polignac number, because 3656215397 - 2¹⁸ = 3655953253 is a prime.

It is a super-2 number, since 2×3656215397² = 26735822058519735218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656215327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2438354 + ... + 2439852.

It is an arithmetic number, because the mean of its divisors is an integer number (238545000).

Almost surely, 2^3656215397 is an apocalyptic number.

It is an amenable number.

3656215397 is a deficient number, since it is larger than the sum of its proper divisors (160504603).

3656215397 is a wasteful number, since it uses less digits than its factorization.

3656215397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236.

The product of its digits is 1020600, while the sum is 47.

The square root of 3656215397 is about 60466.6469799674. The cubic root of 3656215397 is about 1540.5551769334. Note that the first 3 decimals are identical.

The spelling of 3656215397 in words is "three billion, six hundred fifty-six million, two hundred fifteen thousand, three hundred ninety-seven".