978213403 has 2 divisors, whose sum is σ = 978213404. Its totient is φ = 978213402.

The previous prime is 978213373. The next prime is 978213409. The reversal of 978213403 is 304312879.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978213403 is a prime.

It is not a weakly prime, because it can be changed into another prime (978213409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489106701 + 489106702.

It is an arithmetic number, because the mean of its divisors is an integer number (489106702).

Almost surely, 2^978213403 is an apocalyptic number.

978213403 is a deficient number, since it is larger than the sum of its proper divisors (1).

978213403 is an equidigital number, since it uses as much as digits as its factorization.

978213403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 978213403 is about 31276.4032938572. The cubic root of 978213403 is about 992.6844137018.

The spelling of 978213403 in words is "nine hundred seventy-eight million, two hundred thirteen thousand, four hundred three".