2821890397 has 2 divisors, whose sum is σ = 2821890398. Its totient is φ = 2821890396.

The previous prime is 2821890377. The next prime is 2821890419. The reversal of 2821890397 is 7930981282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1801662916 + 1020227481 = 42446^2 + 31941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2821890397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2821890397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2821890307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410945198 + 1410945199.

It is an arithmetic number, because the mean of its divisors is an integer number (1410945199).

Almost surely, 2^2821890397 is an apocalyptic number.

It is an amenable number.

2821890397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821890397 is an equidigital number, since it uses as much as digits as its factorization.

2821890397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 2821890397 is about 53121.4683249626. The cubic root of 2821890397 is about 1413.1232673964.

The spelling of 2821890397 in words is "two billion, eight hundred twenty-one million, eight hundred ninety thousand, three hundred ninety-seven".