1977091206 has 16 divisors (see below), whose sum is σ = 3956157504. Its totient is φ = 658701224.

The previous prime is 1977091157. The next prime is 1977091241. The reversal of 1977091206 is 6021907791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69120 + ... + 93443.

It is an arithmetic number, because the mean of its divisors is an integer number (247259844).

Almost surely, 2^1977091206 is an apocalyptic number.

1977091206 is an abundant number, since it is smaller than the sum of its proper divisors (1979066298).

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

1977091206 is a wasteful number, since it uses less digits than its factorization.

1977091206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164595.

The product of its (nonzero) digits is 47628, while the sum is 42.

The square root of 1977091206 is about 44464.4937674995. The cubic root of 1977091206 is about 1255.0920195169.

Adding to 1977091206 its reverse (6021907791), we get a palindrome (7998998997).

The spelling of 1977091206 in words is "one billion, nine hundred seventy-seven million, ninety-one thousand, two hundred six".