1378321 has 12 divisors (see below), whose sum is σ = 1674432. Its totient is φ = 1129128.

The previous prime is 1378319. The next prime is 1378337. The reversal of 1378321 is 1238731.

It is not a de Polignac number, because 1378321 - 2¹ = 1378319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516 + ... + 1738.

It is an arithmetic number, because the mean of its divisors is an integer number (139536).

2^1378321 is an apocalyptic number.

It is an amenable number.

1378321 is a deficient number, since it is larger than the sum of its proper divisors (296111).

1378321 is a wasteful number, since it uses less digits than its factorization.

1378321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1253 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 1378321 is about 1174.0191650906. The cubic root of 1378321 is about 111.2884578567.

The spelling of 1378321 in words is "one million, three hundred seventy-eight thousand, three hundred twenty-one".