1977432188944 has 45 divisors (see below), whose sum is σ = 3846867801847. Its totient is φ = 984708390272.

The previous prime is 1977432188939. The next prime is 1977432188947. The reversal of 1977432188944 is 4498812347791.

The square root of 1977432188944 is 1406212.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1723706410000 + 253725778944 = 1312900^2 + 503712^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977432188944.

It is not an unprimeable number, because it can be changed into a prime (1977432188947) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1783076262 + ... + 1783077370.

Almost surely, 2^{1977432188944} is an apocalyptic number.

1977432188944 is the 1406212-nd square number.

It is an amenable number.

1977432188944 is a deficient number, since it is larger than the sum of its proper divisors (1869435612903).

1977432188944 is an frugal number, since it uses more digits than its factorization.

1977432188944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860 (or 1428 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 67.

The spelling of 1977432188944 in words is "one trillion, nine hundred seventy-seven billion, four hundred thirty-two million, one hundred eighty-eight thousand, nine hundred forty-four".