1385721838 has 8 divisors (see below), whose sum is σ = 2079478440. Its totient is φ = 692562360.

The previous prime is 1385721787. The next prime is 1385721859. The reversal of 1385721838 is 8381275831.

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, 143433 + ... + 152788.

It is an arithmetic number, because the mean of its divisors is an integer number (259934805).

Almost surely, 2^1385721838 is an apocalyptic number.

1385721838 is a deficient number, since it is larger than the sum of its proper divisors (693756602).

1385721838 is a wasteful number, since it uses less digits than its factorization.

1385721838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298562.

The product of its digits is 322560, while the sum is 46.

The square root of 1385721838 is about 37225.2849283924. The cubic root of 1385721838 is about 1114.8728867674.

The spelling of 1385721838 in words is "one billion, three hundred eighty-five million, seven hundred twenty-one thousand, eight hundred thirty-eight".