2091397 has 16 divisors (see below), whose sum is σ = 2639232. Its totient is φ = 1609920.

The previous prime is 2091389. The next prime is 2091409. The reversal of 2091397 is 7931902.

It is a cyclic number.

It is not a de Polignac number, because 2091397 - 2³ = 2091389 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 (2091317) 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 15 ways as a sum of consecutive naturals, for example, 12003 + ... + 12175.

It is an arithmetic number, because the mean of its divisors is an integer number (164952).

2^2091397 is an apocalyptic number.

It is an amenable number.

2091397 is a deficient number, since it is larger than the sum of its proper divisors (547835).

2091397 is a wasteful number, since it uses less digits than its factorization.

2091397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 2091397 is about 1446.1663113211. The cubic root of 2091397 is about 127.8828069595.

The spelling of 2091397 in words is "two million, ninety-one thousand, three hundred ninety-seven".