1378138239 has 16 divisors (see below), whose sum is σ = 2043503200. Its totient is φ = 917941248.

The previous prime is 1378138199. The next prime is 1378138243. The reversal of 1378138239 is 9328318731.

It is a happy number.

1378138239 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1378138239 - 2⁸ = 1378137983 is a prime.

It is a super-2 number, since 2×1378138239² = 3798530011588042242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1378138194 and 1378138203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378138639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8997 + ... + 53265.

It is an arithmetic number, because the mean of its divisors is an integer number (127718950).

Almost surely, 2^1378138239 is an apocalyptic number.

1378138239 is a deficient number, since it is larger than the sum of its proper divisors (665364961).

1378138239 is a wasteful number, since it uses less digits than its factorization.

1378138239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45431 (or 45425 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1378138239 is about 37123.2843239927. The cubic root of 1378138239 is about 1112.8353880687.

The spelling of 1378138239 in words is "one billion, three hundred seventy-eight million, one hundred thirty-eight thousand, two hundred thirty-nine".