1281438384 has 20 divisors (see below), whose sum is σ = 3310382616. Its totient is φ = 427146112.

The previous prime is 1281438373. The next prime is 1281438401. The reversal of 1281438384 is 4838341821.

It is a nude number because it is divisible by every one of its digits.

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, 13348269 + ... + 13348364.

Almost surely, 2^1281438384 is an apocalyptic number.

It is an amenable number.

1281438384 is an abundant number, since it is smaller than the sum of its proper divisors (2028944232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1281438384 is a wasteful number, since it uses less digits than its factorization.

1281438384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26696644 (or 26696638 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 1281438384 is about 35797.1840233279. The cubic root of 1281438384 is about 1086.1736001050.

The spelling of 1281438384 in words is "one billion, two hundred eighty-one million, four hundred thirty-eight thousand, three hundred eighty-four".