1380197947 has 4 divisors (see below), whose sum is σ = 1381583296. Its totient is φ = 1378812600.

The previous prime is 1380197879. The next prime is 1380197969. The reversal of 1380197947 is 7497910831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1380197947 is a prime.

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 1380197947.

It is not an unprimeable number, because it can be changed into a prime (1380197747) 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 in 3 ways as a sum of consecutive naturals, for example, 691179 + ... + 693172.

It is an arithmetic number, because the mean of its divisors is an integer number (345395824).

Almost surely, 2^1380197947 is an apocalyptic number.

1380197947 is a deficient number, since it is larger than the sum of its proper divisors (1385349).

1380197947 is an equidigital number, since it uses as much as digits as its factorization.

1380197947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385348.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 1380197947 is about 37151.0154235386. The cubic root of 1380197947 is about 1113.3895112409.

The spelling of 1380197947 in words is "one billion, three hundred eighty million, one hundred ninety-seven thousand, nine hundred forty-seven".