4491397 has 4 divisors (see below), whose sum is σ = 4507020. Its totient is φ = 4475776.

The previous prime is 4491359. The next prime is 4491401. The reversal of 4491397 is 7931944.

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 2414916 + 2076481 = 1554^2 + 1441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4491397 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 (4491337) 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, 7372 + ... + 7957.

It is an arithmetic number, because the mean of its divisors is an integer number (1126755).

Almost surely, 2^4491397 is an apocalyptic number.

It is an amenable number.

4491397 is a deficient number, since it is larger than the sum of its proper divisors (15623).

4491397 is a wasteful number, since it uses less digits than its factorization.

4491397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15622.

The product of its digits is 27216, while the sum is 37.

The square root of 4491397 is about 2119.2916269358. The cubic root of 4491397 is about 164.9910861423.

It can be divided in two parts, 4 and 491397, that added together give a square (491401 = 701²).

The spelling of 4491397 in words is "four million, four hundred ninety-one thousand, three hundred ninety-seven".