1966978972 has 36 divisors (see below), whose sum is σ = 4054925280. Its totient is φ = 832313664.

The previous prime is 1966978963. The next prime is 1966979023. The reversal of 1966978972 is 2798796691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48033 + ... + 79000.

Almost surely, 2^1966978972 is an apocalyptic number.

It is an amenable number.

1966978972 is an abundant number, since it is smaller than the sum of its proper divisors (2087946308).

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

1966978972 is a wasteful number, since it uses less digits than its factorization.

1966978972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127130 (or 127121 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 64.

The square root of 1966978972 is about 44350.6366583390. The cubic root of 1966978972 is about 1252.9485533843.

The spelling of 1966978972 in words is "one billion, nine hundred sixty-six million, nine hundred seventy-eight thousand, nine hundred seventy-two".