1947879966 has 16 divisors (see below), whose sum is σ = 3896210304. Its totient is φ = 649218264.

The previous prime is 1947879961. The next prime is 1947879977. The reversal of 1947879966 is 6699787491.

It is a super-2 number, since 2×1947879966² = 7588472723888322312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1947879897 and 1947879906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947879961) 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, 69135 + ... + 93141.

It is an arithmetic number, because the mean of its divisors is an integer number (243513144).

Almost surely, 2^1947879966 is an apocalyptic number.

1947879966 is an abundant number, since it is smaller than the sum of its proper divisors (1948330338).

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

1947879966 is a wasteful number, since it uses less digits than its factorization.

1947879966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37535.

The product of its digits is 41150592, while the sum is 66.

The square root of 1947879966 is about 44134.7931455445. The cubic root of 1947879966 is about 1248.8800562939.

The spelling of 1947879966 in words is "one billion, nine hundred forty-seven million, eight hundred seventy-nine thousand, nine hundred sixty-six".