1978326099 has 10 divisors (see below), whose sum is σ = 2955277380. Its totient is φ = 1318884012.

The previous prime is 1978326067. The next prime is 1978326107. The reversal of 1978326099 is 9906238791.

It is not a de Polignac number, because 1978326099 - 2⁵ = 1978326067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1978326059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12211809 + ... + 12211970.

It is an arithmetic number, because the mean of its divisors is an integer number (295527738).

Almost surely, 2^1978326099 is an apocalyptic number.

1978326099 is a deficient number, since it is larger than the sum of its proper divisors (976951281).

1978326099 is an equidigital number, since it uses as much as digits as its factorization.

1978326099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24423791 (or 24423782 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 1978326099 is about 44478.3778818428. The cubic root of 1978326099 is about 1255.3532756771.

The spelling of 1978326099 in words is "one billion, nine hundred seventy-eight million, three hundred twenty-six thousand, ninety-nine".