978380947 has 2 divisors, whose sum is σ = 978380948. Its totient is φ = 978380946.

The previous prime is 978380941. The next prime is 978380981. The reversal of 978380947 is 749083879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 978380947 - 2¹⁵ = 978348179 is a prime.

It is not a weakly prime, because it can be changed into another prime (978380941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489190473 + 489190474.

It is an arithmetic number, because the mean of its divisors is an integer number (489190474).

Almost surely, 2^978380947 is an apocalyptic number.

978380947 is a deficient number, since it is larger than the sum of its proper divisors (1).

978380947 is an equidigital number, since it uses as much as digits as its factorization.

978380947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 978380947 is about 31279.0816201499. The cubic root of 978380947 is about 992.7410846431.

The spelling of 978380947 in words is "nine hundred seventy-eight million, three hundred eighty thousand, nine hundred forty-seven".