7478921 has 8 divisors (see below), whose sum is σ = 7744704. Its totient is φ = 7216560.

The previous prime is 7478893. The next prime is 7478941. The reversal of 7478921 is 1298747.

7478921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7478921 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7478941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4076 + ... + 5618.

It is an arithmetic number, because the mean of its divisors is an integer number (968088).

Almost surely, 2^7478921 is an apocalyptic number.

It is an amenable number.

7478921 is a deficient number, since it is larger than the sum of its proper divisors (265783).

7478921 is a wasteful number, since it uses less digits than its factorization.

7478921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its digits is 28224, while the sum is 38.

The square root of 7478921 is about 2734.7615983848. The cubic root of 7478921 is about 195.5598288901.

The spelling of 7478921 in words is "seven million, four hundred seventy-eight thousand, nine hundred twenty-one".