1992903978 has 32 divisors (see below), whose sum is σ = 4294180800. Its totient is φ = 612948096.

The previous prime is 1992903971. The next prime is 1992903989. The reversal of 1992903978 is 8793092991.

It is not an unprimeable number, because it can be changed into a prime (1992903971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290593 + ... + 297371.

It is an arithmetic number, because the mean of its divisors is an integer number (134193150).

Almost surely, 2^1992903978 is an apocalyptic number.

1992903978 is an abundant number, since it is smaller than the sum of its proper divisors (2301276822).

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

1992903978 is a wasteful number, since it uses less digits than its factorization.

1992903978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10566.

The product of its (nonzero) digits is 2204496, while the sum is 57.

The square root of 1992903978 is about 44641.9531158752. The cubic root of 1992903978 is about 1258.4292129019.

The spelling of 1992903978 in words is "one billion, nine hundred ninety-two million, nine hundred three thousand, nine hundred seventy-eight".