1977390812 has 12 divisors (see below), whose sum is σ = 3462320400. Its totient is φ = 988156416.

The previous prime is 1977390757. The next prime is 1977390817. The reversal of 1977390812 is 2180937791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977390817) 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 3 ways as a sum of consecutive naturals, for example, 126437 + ... + 141212.

It is an arithmetic number, because the mean of its divisors is an integer number (288526700).

Almost surely, 2^1977390812 is an apocalyptic number.

It is an amenable number.

1977390812 is a deficient number, since it is larger than the sum of its proper divisors (1484929588).

1977390812 is a wasteful number, since it uses less digits than its factorization.

1977390812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269500 (or 269498 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1977390812 is about 44467.8626875635. The cubic root of 1977390812 is about 1255.1554146881.

The spelling of 1977390812 in words is "one billion, nine hundred seventy-seven million, three hundred ninety thousand, eight hundred twelve".