1389752638 has 8 divisors (see below), whose sum is σ = 2091332880. Its totient is φ = 692641680.

The previous prime is 1389752603. The next prime is 1389752641. The reversal of 1389752638 is 8362579831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1116543 + ... + 1117786.

It is an arithmetic number, because the mean of its divisors is an integer number (261416610).

Almost surely, 2^1389752638 is an apocalyptic number.

1389752638 is a deficient number, since it is larger than the sum of its proper divisors (701580242).

1389752638 is a wasteful number, since it uses less digits than its factorization.

1389752638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234642.

The product of its digits is 2177280, while the sum is 52.

The square root of 1389752638 is about 37279.3862342180. The cubic root of 1389752638 is about 1115.9528243869.

The spelling of 1389752638 in words is "one billion, three hundred eighty-nine million, seven hundred fifty-two thousand, six hundred thirty-eight".