1385447021 has 24 divisors (see below), whose sum is σ = 1697578560. Its totient is φ = 1125180672.

The previous prime is 1385447003. The next prime is 1385447051. The reversal of 1385447021 is 1207445831.

It is a de Polignac number, because none of the positive numbers 2^k-1385447021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385447051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114845 + ... + 126333.

It is an arithmetic number, because the mean of its divisors is an integer number (70732440).

Almost surely, 2^1385447021 is an apocalyptic number.

It is an amenable number.

1385447021 is a deficient number, since it is larger than the sum of its proper divisors (312131539).

1385447021 is a wasteful number, since it uses less digits than its factorization.

1385447021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11633 (or 11626 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 1385447021 is about 37221.5934774426. The cubic root of 1385447021 is about 1114.7991811915.

The spelling of 1385447021 in words is "one billion, three hundred eighty-five million, four hundred forty-seven thousand, twenty-one".