1978909196 has 24 divisors (see below), whose sum is σ = 3791290944. Its totient is φ = 896320080.

The previous prime is 1978909193. The next prime is 1978909217. The reversal of 1978909196 is 6919098791.

It is not an unprimeable number, because it can be changed into a prime (1978909193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67010 + ... + 91913.

It is an arithmetic number, because the mean of its divisors is an integer number (157970456).

Almost surely, 2^1978909196 is an apocalyptic number.

It is an amenable number.

1978909196 is a deficient number, since it is larger than the sum of its proper divisors (1812381748).

1978909196 is a wasteful number, since it uses less digits than its factorization.

1978909196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159221 (or 159219 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 59.

The square root of 1978909196 is about 44484.9322355334. The cubic root of 1978909196 is about 1255.4765989291.

The spelling of 1978909196 in words is "one billion, nine hundred seventy-eight million, nine hundred nine thousand, one hundred ninety-six".