1378375769 has 8 divisors (see below), whose sum is σ = 1389450240. Its totient is φ = 1367316256.

The previous prime is 1378375697. The next prime is 1378375777. The reversal of 1378375769 is 9675738731.

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-1378375769 is a prime.

It is a super-2 number, since 2×1378375769² = 3799839521132682722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378375799) 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, 246992 + ... + 252510.

It is an arithmetic number, because the mean of its divisors is an integer number (173681280).

Almost surely, 2^1378375769 is an apocalyptic number.

It is an amenable number.

1378375769 is a deficient number, since it is larger than the sum of its proper divisors (11074471).

1378375769 is a wasteful number, since it uses less digits than its factorization.

1378375769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479.

The product of its digits is 6667920, while the sum is 56.

The square root of 1378375769 is about 37126.4833912397. The cubic root of 1378375769 is about 1112.8993189084.

The spelling of 1378375769 in words is "one billion, three hundred seventy-eight million, three hundred seventy-five thousand, seven hundred sixty-nine".