1378233639 has 12 divisors (see below), whose sum is σ = 2107886976. Its totient is φ = 864773952.

The previous prime is 1378233607. The next prime is 1378233641. The reversal of 1378233639 is 9363328731.

1378233639 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 2 + 3 + 3 + 639 = 666.

It is not a de Polignac number, because 1378233639 - 2⁵ = 1378233607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1378233594 and 1378233603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378233679) 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, 4503879 + ... + 4504184.

It is an arithmetic number, because the mean of its divisors is an integer number (175657248).

Almost surely, 2^1378233639 is an apocalyptic number.

1378233639 is a deficient number, since it is larger than the sum of its proper divisors (729653337).

1378233639 is a wasteful number, since it uses less digits than its factorization.

1378233639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9008086 (or 9008083 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 1378233639 is about 37124.5692096218. The cubic root of 1378233639 is about 1112.8610657168.

The spelling of 1378233639 in words is "one billion, three hundred seventy-eight million, two hundred thirty-three thousand, six hundred thirty-nine".