1381517378 has 8 divisors (see below), whose sum is σ = 2080340172. Its totient is φ = 688070656.

The previous prime is 1381517369. The next prime is 1381517381. The reversal of 1381517378 is 8737151831.

It can be written as a sum of positive squares in 2 ways, for example, as 1316020729 + 65496649 = 36277^2 + 8093^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343375 + ... + 1344402.

Almost surely, 2^1381517378 is an apocalyptic number.

1381517378 is a deficient number, since it is larger than the sum of its proper divisors (698822794).

1381517378 is a wasteful number, since it uses less digits than its factorization.

1381517378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688036.

The product of its digits is 141120, while the sum is 44.

The square root of 1381517378 is about 37168.7688523578. The cubic root of 1381517378 is about 1113.7441880869.

The spelling of 1381517378 in words is "one billion, three hundred eighty-one million, five hundred seventeen thousand, three hundred seventy-eight".