1385205621 has 8 divisors (see below), whose sum is σ = 1944148320. Its totient is φ = 874866672.

The previous prime is 1385205617. The next prime is 1385205683. The reversal of 1385205621 is 1265025831.

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

It is not a de Polignac number, because 1385205621 - 2² = 1385205617 is a prime.

It is a super-2 number, since 2×1385205621² = 3837589224899991282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385205691) 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, 12150870 + ... + 12150983.

It is an arithmetic number, because the mean of its divisors is an integer number (243018540).

Almost surely, 2^1385205621 is an apocalyptic number.

It is an amenable number.

1385205621 is a deficient number, since it is larger than the sum of its proper divisors (558942699).

1385205621 is a wasteful number, since it uses less digits than its factorization.

1385205621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24301875.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 1385205621 is about 37218.3505948343. The cubic root of 1385205621 is about 1114.7344299716.

The spelling of 1385205621 in words is "one billion, three hundred eighty-five million, two hundred five thousand, six hundred twenty-one".