1384921 has 2 divisors, whose sum is σ = 1384922. Its totient is φ = 1384920.

The previous prime is 1384919. The next prime is 1384937. The reversal of 1384921 is 1294831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929296 + 455625 = 964^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1384921 - 2¹ = 1384919 is a prime.

Together with 1384919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1384921.

It is not a weakly prime, because it can be changed into another prime (1384951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692460 + 692461.

It is an arithmetic number, because the mean of its divisors is an integer number (692461).

2^1384921 is an apocalyptic number.

It is an amenable number.

1384921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1384921 is an equidigital number, since it uses as much as digits as its factorization.

1384921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 1384921 is about 1176.8266652315. The cubic root of 1384921 is about 111.4658075829.

The spelling of 1384921 in words is "one million, three hundred eighty-four thousand, nine hundred twenty-one".