1378684481 has 4 divisors (see below), whose sum is σ = 1387142832. Its totient is φ = 1370226132.

The previous prime is 1378684477. The next prime is 1378684487. The reversal of 1378684481 is 1844868731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1378684481 - 2² = 1378684477 is a prime.

It is a super-2 number, since 2×1378684481² = 3801541796300478722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378684487) 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, 4228931 + ... + 4229256.

It is an arithmetic number, because the mean of its divisors is an integer number (346785708).

Almost surely, 2^1378684481 is an apocalyptic number.

It is an amenable number.

1378684481 is a deficient number, since it is larger than the sum of its proper divisors (8458351).

1378684481 is an equidigital number, since it uses as much as digits as its factorization.

1378684481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8458350.

The product of its digits is 1032192, while the sum is 50.

The square root of 1378684481 is about 37130.6407297262. The cubic root of 1378684481 is about 1112.9823973007.

The spelling of 1378684481 in words is "one billion, three hundred seventy-eight million, six hundred eighty-four thousand, four hundred eighty-one".