7978427 has 8 divisors (see below), whose sum is σ = 8152656. Its totient is φ = 7805952.

The previous prime is 7978409. The next prime is 7978429. The reversal of 7978427 is 7248797.

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-7978427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7978429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12623 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (1019082).

Almost surely, 2^7978427 is an apocalyptic number.

7978427 is a deficient number, since it is larger than the sum of its proper divisors (174229).

7978427 is a wasteful number, since it uses less digits than its factorization.

7978427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its digits is 197568, while the sum is 44.

The square root of 7978427 is about 2824.6109466615. The cubic root of 7978427 is about 199.8200631622.

The spelling of 7978427 in words is "seven million, nine hundred seventy-eight thousand, four hundred twenty-seven".