978867623 has 2 divisors, whose sum is σ = 978867624. Its totient is φ = 978867622.

The previous prime is 978867619. The next prime is 978867719. The reversal of 978867623 is 326768879.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978867623 - 2² = 978867619 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978827623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489433811 + 489433812.

It is an arithmetic number, because the mean of its divisors is an integer number (489433812).

Almost surely, 2^978867623 is an apocalyptic number.

978867623 is a deficient number, since it is larger than the sum of its proper divisors (1).

978867623 is an equidigital number, since it uses as much as digits as its factorization.

978867623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The square root of 978867623 is about 31286.8602291761. The cubic root of 978867623 is about 992.9056637448.

The spelling of 978867623 in words is "nine hundred seventy-eight million, eight hundred sixty-seven thousand, six hundred twenty-three".