1381777 has 4 divisors (see below), whose sum is σ = 1463076. Its totient is φ = 1300480.

The previous prime is 1381769. The next prime is 1381819. The reversal of 1381777 is 7771831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7771831 = 389 ⋅19979.

It can be written as a sum of positive squares in 2 ways, for example, as 1234321 + 147456 = 1111^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381777 - 2³ = 1381769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381727) 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, 40624 + ... + 40657.

It is an arithmetic number, because the mean of its divisors is an integer number (365769).

2^1381777 is an apocalyptic number.

1381777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1381777 is a deficient number, since it is larger than the sum of its proper divisors (81299).

1381777 is an equidigital number, since it uses as much as digits as its factorization.

1381777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81298.

The product of its digits is 8232, while the sum is 34.

The square root of 1381777 is about 1175.4901105496. The cubic root of 1381777 is about 111.3813950602.

The spelling of 1381777 in words is "one million, three hundred eighty-one thousand, seven hundred seventy-seven".