1378688893 has 4 divisors (see below), whose sum is σ = 1379058460. Its totient is φ = 1378319328.

The previous prime is 1378688873. The next prime is 1378688897. The reversal of 1378688893 is 3988868731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3988868731 = 37 ⋅107807263.

It can be written as a sum of positive squares in 2 ways, for example, as 943841284 + 434847609 = 30722^2 + 20853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378688893 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 (1378688897) 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, 179130 + ... + 186667.

It is an arithmetic number, because the mean of its divisors is an integer number (344764615).

Almost surely, 2^1378688893 is an apocalyptic number.

It is an amenable number.

1378688893 is a deficient number, since it is larger than the sum of its proper divisors (369567).

1378688893 is an equidigital number, since it uses as much as digits as its factorization.

1378688893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369566.

The product of its digits is 13934592, while the sum is 61.

The square root of 1378688893 is about 37130.7001415271. The cubic root of 1378688893 is about 1112.9835845371.

The spelling of 1378688893 in words is "one billion, three hundred seventy-eight million, six hundred eighty-eight thousand, eight hundred ninety-three".