7978403 has 2 divisors, whose sum is σ = 7978404. Its totient is φ = 7978402.

The previous prime is 7978381. The next prime is 7978409. The reversal of 7978403 is 3048797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7978403 - 2⁶ = 7978339 is a prime.

It is not a weakly prime, because it can be changed into another prime (7978409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989201 + 3989202.

It is an arithmetic number, because the mean of its divisors is an integer number (3989202).

Almost surely, 2^7978403 is an apocalyptic number.

7978403 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978403 is an equidigital number, since it uses as much as digits as its factorization.

7978403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 7978403 is about 2824.6066982856. The cubic root of 7978403 is about 199.8198628017.

The spelling of 7978403 in words is "seven million, nine hundred seventy-eight thousand, four hundred three".