1994431980 has 24 divisors (see below), whose sum is σ = 5584409712. Its totient is φ = 531848512.

The previous prime is 1994431963. The next prime is 1994431991. The reversal of 1994431980 is 891344991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16620207 + ... + 16620326.

It is an arithmetic number, because the mean of its divisors is an integer number (232683738).

Almost surely, 2^1994431980 is an apocalyptic number.

1994431980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1994431980 is an abundant number, since it is smaller than the sum of its proper divisors (3589977732).

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

1994431980 is a wasteful number, since it uses less digits than its factorization.

1994431980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33240545 (or 33240543 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 1994431980 is about 44659.0638056823. The cubic root of 1994431980 is about 1258.7507522479.

The spelling of 1994431980 in words is "one billion, nine hundred ninety-four million, four hundred thirty-one thousand, nine hundred eighty".