1378238787 has 16 divisors (see below), whose sum is σ = 2054846880. Its totient is φ = 912970656.

The previous prime is 1378238779. The next prime is 1378238803. The reversal of 1378238787 is 7878328731.

It is a happy number.

It is not a de Polignac number, because 1378238787 - 2³ = 1378238779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378238737) 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 15 ways as a sum of consecutive naturals, for example, 158328 + ... + 166805.

It is an arithmetic number, because the mean of its divisors is an integer number (128427930).

Almost surely, 2^1378238787 is an apocalyptic number.

1378238787 is a deficient number, since it is larger than the sum of its proper divisors (676608093).

1378238787 is a wasteful number, since it uses less digits than its factorization.

1378238787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325299 (or 325293 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 1378238787 is about 37124.6385436949. The cubic root of 1378238787 is about 1112.8624513071.

The spelling of 1378238787 in words is "one billion, three hundred seventy-eight million, two hundred thirty-eight thousand, seven hundred eighty-seven".