2197649 has 4 divisors (see below), whose sum is σ = 2273460. Its totient is φ = 2121840.

The previous prime is 2197633. The next prime is 2197651. The reversal of 2197649 is 9467912.

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 774400 + 1423249 = 880^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197649 - 2⁴ = 2197633 is a prime.

It is a super-2 number, since 2×2197649² = 9659322254402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2197609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37862 + ... + 37919.

It is an arithmetic number, because the mean of its divisors is an integer number (568365).

2^2197649 is an apocalyptic number.

2197649 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2197649 is a deficient number, since it is larger than the sum of its proper divisors (75811).

2197649 is an equidigital number, since it uses as much as digits as its factorization.

2197649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75810.

The product of its digits is 27216, while the sum is 38.

The square root of 2197649 is about 1482.4469636382. The cubic root of 2197649 is about 130.0127995287.

The spelling of 2197649 in words is "two million, one hundred ninety-seven thousand, six hundred forty-nine".