978928939 has 2 divisors, whose sum is σ = 978928940. Its totient is φ = 978928938.

The previous prime is 978928919. The next prime is 978928949. The reversal of 978928939 is 939829879.

978928939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (939829879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 978928939 - 2²¹ = 976831787 is a prime.

It is a super-2 number, since 2×978928939² = 1916603735223331442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (978928919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489464469 + 489464470.

It is an arithmetic number, because the mean of its divisors is an integer number (489464470).

Almost surely, 2^978928939 is an apocalyptic number.

978928939 is a deficient number, since it is larger than the sum of its proper divisors (1).

978928939 is an equidigital number, since it uses as much as digits as its factorization.

978928939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 64.

The square root of 978928939 is about 31287.8401140123. The cubic root of 978928939 is about 992.9263950916.

The spelling of 978928939 in words is "nine hundred seventy-eight million, nine hundred twenty-eight thousand, nine hundred thirty-nine".