1378240636 has 24 divisors (see below), whose sum is σ = 2448008640. Its totient is φ = 678849600.

The previous prime is 1378240607. The next prime is 1378240663. The reversal of 1378240636 is 6360428731.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140946 + ... + 150406.

It is an arithmetic number, because the mean of its divisors is an integer number (102000360).

Almost surely, 2^1378240636 is an apocalyptic number.

It is an amenable number.

1378240636 is a deficient number, since it is larger than the sum of its proper divisors (1069768004).

1378240636 is a wasteful number, since it uses less digits than its factorization.

1378240636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005 (or 10003 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 1378240636 is about 37124.6634462859. The cubic root of 1378240636 is about 1112.8629489669.

The spelling of 1378240636 in words is "one billion, three hundred seventy-eight million, two hundred forty thousand, six hundred thirty-six".