1385623821 has 8 divisors (see below), whose sum is σ = 1852107264. Its totient is φ = 921444800.

The previous prime is 1385623819. The next prime is 1385623831. The reversal of 1385623821 is 1283265831.

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

It is a cyclic number.

It is not a de Polignac number, because 1385623821 - 2¹ = 1385623819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1385623821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385623831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574701 + ... + 577106.

It is an arithmetic number, because the mean of its divisors is an integer number (231513408).

Almost surely, 2^1385623821 is an apocalyptic number.

It is an amenable number.

1385623821 is a deficient number, since it is larger than the sum of its proper divisors (466483443).

1385623821 is a wasteful number, since it uses less digits than its factorization.

1385623821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152211.

The product of its digits is 69120, while the sum is 39.

The square root of 1385623821 is about 37223.9683671690. The cubic root of 1385623821 is about 1114.8465998486.

The spelling of 1385623821 in words is "one billion, three hundred eighty-five million, six hundred twenty-three thousand, eight hundred twenty-one".