978995923 has 2 divisors, whose sum is σ = 978995924. Its totient is φ = 978995922.

The previous prime is 978995879. The next prime is 978995933. The reversal of 978995923 is 329599879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 978995923 - 2²¹ = 976898771 is a prime.

It is not a weakly prime, because it can be changed into another prime (978995933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489497961 + 489497962.

It is an arithmetic number, because the mean of its divisors is an integer number (489497962).

Almost surely, 2^978995923 is an apocalyptic number.

978995923 is a deficient number, since it is larger than the sum of its proper divisors (1).

978995923 is an equidigital number, since it uses as much as digits as its factorization.

978995923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 61.

The square root of 978995923 is about 31288.9105435137. The cubic root of 978995923 is about 992.9490418375.

The spelling of 978995923 in words is "nine hundred seventy-eight million, nine hundred ninety-five thousand, nine hundred twenty-three".