1380077785 has 4 divisors (see below), whose sum is σ = 1656093348. Its totient is φ = 1104062224.

The previous prime is 1380077767. The next prime is 1380077789. The reversal of 1380077785 is 5877700831.

It is a happy number.

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 502970329 + 877107456 = 22427^2 + 29616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380077785 - 2¹¹ = 1380075737 is a prime.

It is a super-2 number, since 2×1380077785² = 3809229385301012450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380077789) 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, 138007774 + ... + 138007783.

It is an arithmetic number, because the mean of its divisors is an integer number (414023337).

Almost surely, 2^1380077785 is an apocalyptic number.

It is an amenable number.

1380077785 is a deficient number, since it is larger than the sum of its proper divisors (276015563).

1380077785 is an equidigital number, since it uses as much as digits as its factorization.

1380077785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276015562.

The product of its (nonzero) digits is 329280, while the sum is 46.

The square root of 1380077785 is about 37149.3981781670. The cubic root of 1380077785 is about 1113.3571992107.

The spelling of 1380077785 in words is "one billion, three hundred eighty million, seventy-seven thousand, seven hundred eighty-five".