1377720137 has 4 divisors (see below), whose sum is σ = 1458762516. Its totient is φ = 1296677760.

The previous prime is 1377720109. The next prime is 1377720187. The reversal of 1377720137 is 7310277731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 758506681 + 619213456 = 27541^2 + 24884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377720137 - 2⁸ = 1377719881 is a prime.

It is a super-2 number, since 2×1377720137² = 3796225551790597538, which contains 22 as substring.

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 1377720137.

It is not an unprimeable number, because it can be changed into a prime (1377720187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40521164 + ... + 40521197.

It is an arithmetic number, because the mean of its divisors is an integer number (364690629).

Almost surely, 2^1377720137 is an apocalyptic number.

1377720137 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1377720137 is a deficient number, since it is larger than the sum of its proper divisors (81042379).

1377720137 is an equidigital number, since it uses as much as digits as its factorization.

1377720137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81042378.

The product of its (nonzero) digits is 43218, while the sum is 38.

The square root of 1377720137 is about 37117.6526332148. The cubic root of 1377720137 is about 1112.7228387011.

Adding to 1377720137 its reverse (7310277731), we get a palindrome (8687997868).

The spelling of 1377720137 in words is "one billion, three hundred seventy-seven million, seven hundred twenty thousand, one hundred thirty-seven".