1385218121 has 8 divisors (see below), whose sum is σ = 1588166784. Its totient is φ = 1183534560.

The previous prime is 1385218111. The next prime is 1385218139. The reversal of 1385218121 is 1218125831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1385218121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1385218111) 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, 313925 + ... + 318306.

It is an arithmetic number, because the mean of its divisors is an integer number (198520848).

Almost surely, 2^1385218121 is an apocalyptic number.

It is an amenable number.

1385218121 is a deficient number, since it is larger than the sum of its proper divisors (202948663).

1385218121 is an equidigital number, since it uses as much as digits as its factorization.

1385218121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632551.

The product of its digits is 3840, while the sum is 32.

The square root of 1385218121 is about 37218.5185223700. The cubic root of 1385218121 is about 1114.7377830571.

The spelling of 1385218121 in words is "one billion, three hundred eighty-five million, two hundred eighteen thousand, one hundred twenty-one".