2821397 has 4 divisors (see below), whose sum is σ = 2833740. Its totient is φ = 2809056.

The previous prime is 2821393. The next prime is 2821411. The reversal of 2821397 is 7931282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1976836 + 844561 = 1406^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821397 - 2² = 2821393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5822 + ... + 6287.

It is an arithmetic number, because the mean of its divisors is an integer number (708435).

2^2821397 is an apocalyptic number.

It is an amenable number.

2821397 is a deficient number, since it is larger than the sum of its proper divisors (12343).

2821397 is a wasteful number, since it uses less digits than its factorization.

2821397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12342.

The product of its digits is 6048, while the sum is 32.

The square root of 2821397 is about 1679.7014615699. The cubic root of 2821397 is about 141.3040902820.

The spelling of 2821397 in words is "two million, eight hundred twenty-one thousand, three hundred ninety-seven".