1380444997 has 8 divisors (see below), whose sum is σ = 1394881400. Its totient is φ = 1366041024.

The previous prime is 1380444983. The next prime is 1380445009. The reversal of 1380444997 is 7994440831.

It can be written as a sum of positive squares in 4 ways, for example, as 107453956 + 1272991041 = 10366^2 + 35679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1380444997 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 1380444997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380444907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82723 + ... + 97999.

It is an arithmetic number, because the mean of its divisors is an integer number (174360175).

Almost surely, 2^1380444997 is an apocalyptic number.

It is an amenable number.

1380444997 is a deficient number, since it is larger than the sum of its proper divisors (14436403).

1380444997 is a wasteful number, since it uses less digits than its factorization.

1380444997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 1380444997 is about 37154.3402175304. The cubic root of 1380444997 is about 1113.4559380577.

The spelling of 1380444997 in words is "one billion, three hundred eighty million, four hundred forty-four thousand, nine hundred ninety-seven".