1977842945 has 16 divisors (see below), whose sum is σ = 2560617360. Its totient is φ = 1457912064.

The previous prime is 1977842927. The next prime is 1977842969. The reversal of 1977842945 is 5492487791.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 328914496 + 1648928449 = 18136^2 + 40607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977842945 - 2⁸ = 1977842689 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8891 + ... + 63519.

It is an arithmetic number, because the mean of its divisors is an integer number (160038585).

Almost surely, 2^1977842945 is an apocalyptic number.

It is an amenable number.

1977842945 is a deficient number, since it is larger than the sum of its proper divisors (582774415).

1977842945 is a wasteful number, since it uses less digits than its factorization.

1977842945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55204.

The product of its digits is 5080320, while the sum is 56.

The square root of 1977842945 is about 44472.9462145246. The cubic root of 1977842945 is about 1255.2510717078.

The spelling of 1977842945 in words is "one billion, nine hundred seventy-seven million, eight hundred forty-two thousand, nine hundred forty-five".