2891397 has 4 divisors (see below), whose sum is σ = 3855200. Its totient is φ = 1927596.

The previous prime is 2891389. The next prime is 2891407. The reversal of 2891397 is 7931982.

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 2891397 - 2³ = 2891389 is a prime.

It is a super-2 number, since 2×2891397² = 16720353223218, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2891597) 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, 481897 + ... + 481902.

It is an arithmetic number, because the mean of its divisors is an integer number (963800).

2^2891397 is an apocalyptic number.

It is an amenable number.

2891397 is a deficient number, since it is larger than the sum of its proper divisors (963803).

2891397 is an equidigital number, since it uses as much as digits as its factorization.

2891397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963802.

The product of its digits is 27216, while the sum is 39.

The square root of 2891397 is about 1700.4108327107. The cubic root of 2891397 is about 142.4631606833.

The spelling of 2891397 in words is "two million, eight hundred ninety-one thousand, three hundred ninety-seven".