1388520345 has 32 divisors (see below), whose sum is σ = 2254412160. Its totient is φ = 729699840.

The previous prime is 1388520307. The next prime is 1388520347. The reversal of 1388520345 is 5430258831.

It is not a de Polignac number, because 1388520345 - 2¹¹ = 1388518297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1388520347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283215 + ... + 288075.

It is an arithmetic number, because the mean of its divisors is an integer number (70450380).

Almost surely, 2^1388520345 is an apocalyptic number.

1388520345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388520345 is a deficient number, since it is larger than the sum of its proper divisors (865891815).

1388520345 is a wasteful number, since it uses less digits than its factorization.

1388520345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5145.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 1388520345 is about 37262.8547618134. The cubic root of 1388520345 is about 1115.6228885710.

The spelling of 1388520345 in words is "one billion, three hundred eighty-eight million, five hundred twenty thousand, three hundred forty-five".