1378377073 has 4 divisors (see below), whose sum is σ = 1411996068. Its totient is φ = 1344758080.

The previous prime is 1378377043. The next prime is 1378377079. The reversal of 1378377073 is 3707738731.

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 473149504 + 905227569 = 21752^2 + 30087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378377073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378377079) 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, 16809436 + ... + 16809517.

It is an arithmetic number, because the mean of its divisors is an integer number (352999017).

Almost surely, 2^1378377073 is an apocalyptic number.

It is an amenable number.

1378377073 is a deficient number, since it is larger than the sum of its proper divisors (33618995).

1378377073 is an equidigital number, since it uses as much as digits as its factorization.

1378377073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33618994.

The product of its (nonzero) digits is 518616, while the sum is 46.

The square root of 1378377073 is about 37126.5009528234. The cubic root of 1378377073 is about 1112.8996698578.

The spelling of 1378377073 in words is "one billion, three hundred seventy-eight million, three hundred seventy-seven thousand, seventy-three".