1388985730 has 32 divisors (see below), whose sum is σ = 2734741440. Its totient is φ = 503737920.

The previous prime is 1388985713. The next prime is 1388985737. The reversal of 1388985730 is 375898831.

It is not an unprimeable number, because it can be changed into a prime (1388985737) 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, 25032 + ... + 58348.

It is an arithmetic number, because the mean of its divisors is an integer number (85460670).

Almost surely, 2^1388985730 is an apocalyptic number.

1388985730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1388985730 is a deficient number, since it is larger than the sum of its proper divisors (1345755710).

1388985730 is a wasteful number, since it uses less digits than its factorization.

1388985730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33714.

The product of its (nonzero) digits is 1451520, while the sum is 52.

The square root of 1388985730 is about 37269.0988621941. The cubic root of 1388985730 is about 1115.7475143199.

The spelling of 1388985730 in words is "one billion, three hundred eighty-eight million, nine hundred eighty-five thousand, seven hundred thirty".