1321906 has 16 divisors (see below), whose sum is σ = 2138400. Its totient is φ = 610848.

The previous prime is 1321897. The next prime is 1321919. The reversal of 1321906 is 6091231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (133650).

2^1321906 is an apocalyptic number.

1321906 is a deficient number, since it is larger than the sum of its proper divisors (816494).

1321906 is a wasteful number, since it uses less digits than its factorization.

1321906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873.

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

The square root of 1321906 is about 1149.7417101245. The cubic root of 1321906 is about 109.7489038449.

The spelling of 1321906 in words is "one million, three hundred twenty-one thousand, nine hundred six".