1378998709 has 8 divisors (see below), whose sum is σ = 1505528928. Its totient is φ = 1252662960.

The previous prime is 1378998697. The next prime is 1378998713. The reversal of 1378998709 is 9078998731.

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

It is a cyclic number.

It is not a de Polignac number, because 1378998709 - 2⁷ = 1378998581 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 (1378998779) 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, 33582 + ... + 62335.

It is an arithmetic number, because the mean of its divisors is an integer number (188191116).

Almost surely, 2^1378998709 is an apocalyptic number.

It is an amenable number.

1378998709 is a deficient number, since it is larger than the sum of its proper divisors (126530219).

1378998709 is a wasteful number, since it uses less digits than its factorization.

1378998709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97235.

The product of its (nonzero) digits is 6858432, while the sum is 61.

The square root of 1378998709 is about 37134.8718726751. The cubic root of 1378998709 is about 1113.0669473847.

The spelling of 1378998709 in words is "one billion, three hundred seventy-eight million, nine hundred ninety-eight thousand, seven hundred nine".