1906321 has 2 divisors, whose sum is σ = 1906322. Its totient is φ = 1906320.

The previous prime is 1906297. The next prime is 1906337. The reversal of 1906321 is 1236091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1030225 + 876096 = 1015^2 + 936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1906321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1906292 and 1906301.

It is not a weakly prime, because it can be changed into another prime (1906361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953160 + 953161.

It is an arithmetic number, because the mean of its divisors is an integer number (953161).

2^1906321 is an apocalyptic number.

It is an amenable number.

1906321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906321 is an equidigital number, since it uses as much as digits as its factorization.

1906321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1906321 is about 1380.6958390609. The cubic root of 1906321 is about 123.9934309735.

The spelling of 1906321 in words is "one million, nine hundred six thousand, three hundred twenty-one".