1978326100 has 18 divisors (see below), whose sum is σ = 4292967854. Its totient is φ = 791330400.

The previous prime is 1978326067. The next prime is 1978326107. The reversal of 1978326100 is 16238791.

It can be written as a sum of positive squares in 3 ways, for example, as 8031556 + 1970294544 = 2834^2 + 44388^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1978326100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978326107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9891531 + ... + 9891730.

Almost surely, 2^1978326100 is an apocalyptic number.

1978326100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1978326100 is an abundant number, since it is smaller than the sum of its proper divisors (2314641754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1978326100 is a wasteful number, since it uses less digits than its factorization.

1978326100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19783275 (or 19783268 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1978326100 is about 44478.3778930842. The cubic root of 1978326100 is about 1255.3532758886.

The spelling of 1978326100 in words is "one billion, nine hundred seventy-eight million, three hundred twenty-six thousand, one hundred".