1377780944 has 20 divisors (see below), whose sum is σ = 2673970596. Its totient is φ = 687724032.

The previous prime is 1377780893. The next prime is 1377780949. The reversal of 1377780944 is 4490877731.

It can be written as a sum of positive squares in 2 ways, for example, as 1012512400 + 365268544 = 31820^2 + 19112^2 .

It is a super-2 number, since 2×1377780944² = 3796560659299062272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1377780892 and 1377780901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377780949) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 63119 + ... + 82094.

Almost surely, 2^1377780944 is an apocalyptic number.

It is an amenable number.

1377780944 is a deficient number, since it is larger than the sum of its proper divisors (1296189652).

1377780944 is a wasteful number, since it uses less digits than its factorization.

1377780944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145814 (or 145808 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 50.

The square root of 1377780944 is about 37118.4717357814. The cubic root of 1377780944 is about 1112.7392088236.

The spelling of 1377780944 in words is "one billion, three hundred seventy-seven million, seven hundred eighty thousand, nine hundred forty-four".