2081397 has 4 divisors (see below), whose sum is σ = 2775200. Its totient is φ = 1387596.

The previous prime is 2081383. The next prime is 2081407. The reversal of 2081397 is 7931802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2081397 - 2¹⁶ = 2015861 is a prime.

It is a D-number.

It is a Duffinian number.

2081397 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346897 + ... + 346902.

It is an arithmetic number, because the mean of its divisors is an integer number (693800).

2^2081397 is an apocalyptic number.

It is an amenable number.

2081397 is a deficient number, since it is larger than the sum of its proper divisors (693803).

2081397 is an equidigital number, since it uses as much as digits as its factorization.

2081397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693802.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 2081397 is about 1442.7047514998. The cubic root of 2081397 is about 127.6786576537.

It can be divided in two parts, 20813 and 97, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 2081397 in words is "two million, eighty-one thousand, three hundred ninety-seven".