1383921 has 24 divisors (see below), whose sum is σ = 2493504. Its totient is φ = 718560.

The previous prime is 1383917. The next prime is 1383923. The reversal of 1383921 is 1293831.

It is not a de Polignac number, because 1383921 - 2² = 1383917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1383923) 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, 306 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (103896).

2^1383921 is an apocalyptic number.

1383921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1383921 is a deficient number, since it is larger than the sum of its proper divisors (1109583).

1383921 is a wasteful number, since it uses less digits than its factorization.

1383921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2018 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1383921 is about 1176.4017171018. The cubic root of 1383921 is about 111.4389726836.

It can be divided in two parts, 1383 and 921, that added together give a square (2304 = 48²).

The spelling of 1383921 in words is "one million, three hundred eighty-three thousand, nine hundred twenty-one".