2197904 has 10 divisors (see below), whose sum is σ = 4258470. Its totient is φ = 1098944.

The previous prime is 2197873. The next prime is 2197907. The reversal of 2197904 is 4097912.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 559504 = 1280^2 + 748^2 .

It is not an unprimeable number, because it can be changed into a prime (2197907) 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 as a sum of consecutive naturals, namely, 68669 + ... + 68700.

It is an arithmetic number, because the mean of its divisors is an integer number (425847).

2^2197904 is an apocalyptic number.

It is an amenable number.

2197904 is a deficient number, since it is larger than the sum of its proper divisors (2060566).

2197904 is a wasteful number, since it uses less digits than its factorization.

2197904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137377 (or 137371 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2197904 is about 1482.5329675930. The cubic root of 2197904 is about 130.0178279298.

The spelling of 2197904 in words is "two million, one hundred ninety-seven thousand, nine hundred four".