1388878326 has 80 divisors (see below), whose sum is σ = 3420418320. Its totient is φ = 417726720.

The previous prime is 1388878289. The next prime is 1388878331. The reversal of 1388878326 is 6238788831.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 241290 + ... + 246978.

It is an arithmetic number, because the mean of its divisors is an integer number (42755229).

Almost surely, 2^1388878326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388878326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710209160).

1388878326 is an abundant number, since it is smaller than the sum of its proper divisors (2031539994).

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

1388878326 is a wasteful number, since it uses less digits than its factorization.

1388878326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851 (or 5842 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 1388878326 is about 37267.6579087015. The cubic root of 1388878326 is about 1115.7187550048.

The spelling of 1388878326 in words is "one billion, three hundred eighty-eight million, eight hundred seventy-eight thousand, three hundred twenty-six".