13781492378 has 4 divisors (see below), whose sum is σ = 20672238570. Its totient is φ = 6890746188.

The previous prime is 13781492369. The next prime is 13781492393. The reversal of 13781492378 is 87329418731.

13781492378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87329418731 = 53197 ⋅1641623.

It can be written as a sum of positive squares in only one way, i.e., 13734199249 + 47293129 = 117193^2 + 6877^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445373093 + ... + 3445373096.

Almost surely, 2^13781492378 is an apocalyptic number.

13781492378 is a deficient number, since it is larger than the sum of its proper divisors (6890746192).

13781492378 is an equidigital number, since it uses as much as digits as its factorization.

13781492378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6890746191.

The product of its digits is 2032128, while the sum is 53.

The spelling of 13781492378 in words is "thirteen billion, seven hundred eighty-one million, four hundred ninety-two thousand, three hundred seventy-eight".