1377939709 has 4 divisors (see below), whose sum is σ = 1458995004. Its totient is φ = 1296884416.

The previous prime is 1377939707. The next prime is 1377939791. The reversal of 1377939709 is 9079397731.

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 483032484 + 894907225 = 21978^2 + 29915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377939709 - 2¹ = 1377939707 is a prime.

It is a super-3 number, since 3×1377939709³ (a number of 28 digits) contains 333 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 1377939709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377939701) 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, 40527622 + ... + 40527655.

It is an arithmetic number, because the mean of its divisors is an integer number (364748751).

Almost surely, 2^1377939709 is an apocalyptic number.

It is an amenable number.

1377939709 is a deficient number, since it is larger than the sum of its proper divisors (81055295).

1377939709 is an equidigital number, since it uses as much as digits as its factorization.

1377939709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81055294.

The product of its (nonzero) digits is 2250423, while the sum is 55.

The square root of 1377939709 is about 37120.6102994011. The cubic root of 1377939709 is about 1112.7819483839.

The spelling of 1377939709 in words is "one billion, three hundred seventy-seven million, nine hundred thirty-nine thousand, seven hundred nine".