1377761980 has 24 divisors (see below), whose sum is σ = 3306629088. Its totient is φ = 472375488.

The previous prime is 1377761951. The next prime is 1377761981. The reversal of 1377761980 is 891677731.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377761981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4920439 + ... + 4920718.

It is an arithmetic number, because the mean of its divisors is an integer number (137776212).

Almost surely, 2^1377761980 is an apocalyptic number.

1377761980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1377761980 is an abundant number, since it is smaller than the sum of its proper divisors (1928867108).

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

1377761980 is a wasteful number, since it uses less digits than its factorization.

1377761980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9841173 (or 9841171 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 1377761980 is about 37118.2162825748. The cubic root of 1377761980 is about 1112.7341034926.

It can be divided in two parts, 13777 and 61980, that added together give a palindrome (75757).

The spelling of 1377761980 in words is "one billion, three hundred seventy-seven million, seven hundred sixty-one thousand, nine hundred eighty".