1388321007 has 16 divisors (see below), whose sum is σ = 1879096320. Its totient is φ = 911573600.

The previous prime is 1388320991. The next prime is 1388321069. The reversal of 1388321007 is 7001238831.

It is a cyclic number.

It is not a de Polignac number, because 1388321007 - 2⁴ = 1388320991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388321087) 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, 248794 + ... + 254312.

It is an arithmetic number, because the mean of its divisors is an integer number (117443520).

Almost surely, 2^1388321007 is an apocalyptic number.

1388321007 is a deficient number, since it is larger than the sum of its proper divisors (490775313).

1388321007 is a wasteful number, since it uses less digits than its factorization.

1388321007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6774.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1388321007 is about 37260.1799109988. The cubic root of 1388321007 is about 1115.5694992013.

Adding to 1388321007 its reverse (7001238831), we get a palindrome (8389559838).

The spelling of 1388321007 in words is "one billion, three hundred eighty-eight million, three hundred twenty-one thousand, seven".