1977822906 has 32 divisors (see below), whose sum is σ = 3973459968. Its totient is φ = 656313840.

The previous prime is 1977822887. The next prime is 1977822967. The reversal of 1977822906 is 6092287791.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2170591 + ... + 2171501.

It is an arithmetic number, because the mean of its divisors is an integer number (124170624).

Almost surely, 2^1977822906 is an apocalyptic number.

1977822906 is an abundant number, since it is smaller than the sum of its proper divisors (1995637062).

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

1977822906 is a wasteful number, since it uses less digits than its factorization.

1977822906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 1977822906 is about 44472.7209196829. The cubic root of 1977822906 is about 1255.2468323990.

The spelling of 1977822906 in words is "one billion, nine hundred seventy-seven million, eight hundred twenty-two thousand, nine hundred six".