1377985747 has 2 divisors, whose sum is σ = 1377985748. Its totient is φ = 1377985746.

The previous prime is 1377985727. The next prime is 1377985751. The reversal of 1377985747 is 7475897731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377985747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1377985691 and 1377985700.

It is not a weakly prime, because it can be changed into another prime (1377985727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688992873 + 688992874.

It is an arithmetic number, because the mean of its divisors is an integer number (688992874).

Almost surely, 2^1377985747 is an apocalyptic number.

1377985747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377985747 is an equidigital number, since it uses as much as digits as its factorization.

1377985747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10372320, while the sum is 58.

The square root of 1377985747 is about 37121.2304079485. The cubic root of 1377985747 is about 1112.7943412059.

The spelling of 1377985747 in words is "one billion, three hundred seventy-seven million, nine hundred eighty-five thousand, seven hundred forty-seven".