1378836481 has 8 divisors (see below), whose sum is σ = 1504463904. Its totient is φ = 1253255520.

The previous prime is 1378836457. The next prime is 1378836491. The reversal of 1378836481 is 1846388731.

It is a happy number.

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

It is not a de Polignac number, because 1378836481 - 2¹¹ = 1378834433 is a prime.

It is a super-2 number, since 2×1378836481² = 3802380082672926722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378836451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86566 + ... + 101248.

It is an arithmetic number, because the mean of its divisors is an integer number (188057988).

Almost surely, 2^1378836481 is an apocalyptic number.

1378836481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1378836481 is a deficient number, since it is larger than the sum of its proper divisors (125627423).

1378836481 is a wasteful number, since it uses less digits than its factorization.

1378836481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23231.

The product of its digits is 774144, while the sum is 49.

The square root of 1378836481 is about 37132.6875003682. The cubic root of 1378836481 is about 1113.0232979104.

The spelling of 1378836481 in words is "one billion, three hundred seventy-eight million, eight hundred thirty-six thousand, four hundred eighty-one".