1378784609 has 12 divisors (see below), whose sum is σ = 1541754000. Its totient is φ = 1229375808.

The previous prime is 1378784599. The next prime is 1378784623. The reversal of 1378784609 is 9064878731.

It is not a de Polignac number, because 1378784609 - 2²⁸ = 1110349153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1378784689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120059 + ... + 131040.

It is an arithmetic number, because the mean of its divisors is an integer number (128479500).

Almost surely, 2^1378784609 is an apocalyptic number.

1378784609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1378784609 is a deficient number, since it is larger than the sum of its proper divisors (162969391).

1378784609 is a wasteful number, since it uses less digits than its factorization.

1378784609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251152 (or 251135 counting only the distinct ones).

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

The square root of 1378784609 is about 37131.9890256366. The cubic root of 1378784609 is about 1113.0093403771.

The spelling of 1378784609 in words is "one billion, three hundred seventy-eight million, seven hundred eighty-four thousand, six hundred nine".