1378518438 has 64 divisors (see below), whose sum is σ = 3173760000. Its totient is φ = 394774560.

The previous prime is 1378518437. The next prime is 1378518469. The reversal of 1378518438 is 8348158731.

It is a happy number.

It is a super-4 number, since 4×1378518438⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378518437) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 624645 + ... + 626847.

It is an arithmetic number, because the mean of its divisors is an integer number (49590000).

Almost surely, 2^1378518438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378518438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1586880000).

1378518438 is an abundant number, since it is smaller than the sum of its proper divisors (1795241562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378518438 is a wasteful number, since it uses less digits than its factorization.

1378518438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737.

The product of its digits is 645120, while the sum is 48.

The square root of 1378518438 is about 37128.4047327649. The cubic root of 1378518438 is about 1112.9377145232.

It can be divided in two parts, 13785 and 18438, that added together give a palindrome (32223).

The spelling of 1378518438 in words is "one billion, three hundred seventy-eight million, five hundred eighteen thousand, four hundred thirty-eight".