978403 has 2 divisors, whose sum is σ = 978404. Its totient is φ = 978402.

The previous prime is 978389. The next prime is 978413. The reversal of 978403 is 304879.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (304879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978403 is a prime.

It is not a weakly prime, because it can be changed into another prime (978413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489201 + 489202.

It is an arithmetic number, because the mean of its divisors is an integer number (489202).

2⁹⁷⁸⁴⁰³ is an apocalyptic number.

978403 is a deficient number, since it is larger than the sum of its proper divisors (1).

978403 is an equidigital number, since it uses as much as digits as its factorization.

978403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 978403 is about 989.1425579764. The cubic root of 978403 is about 99.2748543481.

The spelling of 978403 in words is "nine hundred seventy-eight thousand, four hundred three".