1388396044 has 24 divisors (see below), whose sum is σ = 2922940160. Its totient is φ = 563709456.

The previous prime is 1388396041. The next prime is 1388396057. The reversal of 1388396044 is 4406938831.

It is a junction number, because it is equal to n+sod(n) for n = 1388395985 and 1388396003.

It is not an unprimeable number, because it can be changed into a prime (1388396041) 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 7 ways as a sum of consecutive naturals, for example, 1304352 + ... + 1305415.

Almost surely, 2^1388396044 is an apocalyptic number.

1388396044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1388396044 is an abundant number, since it is smaller than the sum of its proper divisors (1534544116).

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

1388396044 is a wasteful number, since it uses less digits than its factorization.

1388396044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609797 (or 2609795 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 1388396044 is about 37261.1868302662. The cubic root of 1388396044 is about 1115.5895972142.

The spelling of 1388396044 in words is "one billion, three hundred eighty-eight million, three hundred ninety-six thousand, forty-four".