2197642 has 4 divisors (see below), whose sum is σ = 3296466. Its totient is φ = 1098820.

The previous prime is 2197633. The next prime is 2197651. The reversal of 2197642 is 2467912.

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

It is an interprime number because it is at equal distance from previous prime (2197633) and next prime (2197651).

It can be written as a sum of positive squares in only one way, i.e., 2187441 + 10201 = 1479^2 + 101^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 549409 + ... + 549412.

2^2197642 is an apocalyptic number.

2197642 is a deficient number, since it is larger than the sum of its proper divisors (1098824).

2197642 is a wasteful number, since it uses less digits than its factorization.

2197642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098823.

The product of its digits is 6048, while the sum is 31.

The square root of 2197642 is about 1482.4446026749. Note that the first 3 decimals coincide. The cubic root of 2197642 is about 130.0126614887.

The spelling of 2197642 in words is "two million, one hundred ninety-seven thousand, six hundred forty-two".