1378908671 has 4 divisors (see below), whose sum is σ = 1575895632. Its totient is φ = 1181921712.

The previous prime is 1378908659. The next prime is 1378908683. The reversal of 1378908671 is 1768098731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1768098731 = 7 ⋅252585533.

It is an interprime number because it is at equal distance from previous prime (1378908659) and next prime (1378908683).

It is a cyclic number.

It is not a de Polignac number, because 1378908671 - 2¹⁸ = 1378646527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378908371) 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, 98493470 + ... + 98493483.

It is an arithmetic number, because the mean of its divisors is an integer number (393973908).

Almost surely, 2^1378908671 is an apocalyptic number.

1378908671 is a deficient number, since it is larger than the sum of its proper divisors (196986961).

1378908671 is an equidigital number, since it uses as much as digits as its factorization.

1378908671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196986960.

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 1378908671 is about 37133.6595422536. The cubic root of 1378908671 is about 1113.0427219564.

The spelling of 1378908671 in words is "one billion, three hundred seventy-eight million, nine hundred eight thousand, six hundred seventy-one".