1977266906 has 12 divisors (see below), whose sum is σ = 3150628638. Its totient is φ = 930478272.

The previous prime is 1977266873. The next prime is 1977266909. The reversal of 1977266906 is 6096627791.

It can be written as a sum of positive squares in 3 ways, for example, as 1976602681 + 664225 = 44459^2 + 815^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1977266909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1709861 + ... + 1711016.

Almost surely, 2^1977266906 is an apocalyptic number.

1977266906 is a deficient number, since it is larger than the sum of its proper divisors (1173361732).

1977266906 is a wasteful number, since it uses less digits than its factorization.

1977266906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420913 (or 3420896 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 53.

The square root of 1977266906 is about 44466.4694573338. The cubic root of 1977266906 is about 1255.1291975582.

The spelling of 1977266906 in words is "one billion, nine hundred seventy-seven million, two hundred sixty-six thousand, nine hundred six".