1967999980 has 24 divisors (see below), whose sum is σ = 4220733888. Its totient is φ = 770450688.

The previous prime is 1967999941. The next prime is 1967999987. The reversal of 1967999980 is 899997691.

It is not an unprimeable number, because it can be changed into a prime (1967999987) 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, 1045869 + ... + 1047748.

It is an arithmetic number, because the mean of its divisors is an integer number (175863912).

Almost surely, 2^1967999980 is an apocalyptic number.

1967999980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1967999980 is an abundant number, since it is smaller than the sum of its proper divisors (2252733908).

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

1967999980 is a wasteful number, since it uses less digits than its factorization.

1967999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093673 (or 2093671 counting only the distinct ones).

The product of its (nonzero) digits is 19840464, while the sum is 67.

The square root of 1967999980 is about 44362.1458002203. The cubic root of 1967999980 is about 1253.1653069665.

The spelling of 1967999980 in words is "one billion, nine hundred sixty-seven million, nine hundred ninety-nine thousand, nine hundred eighty".