1321957 has 16 divisors (see below), whose sum is σ = 1657600. Its totient is φ = 1026432.

The previous prime is 1321951. The next prime is 1321961. The reversal of 1321957 is 7591231.

It is a cyclic number.

It is not a de Polignac number, because 1321957 - 2¹¹ = 1319909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6544 + ... + 6742.

It is an arithmetic number, because the mean of its divisors is an integer number (103600).

2^1321957 is an apocalyptic number.

It is an amenable number.

1321957 is a deficient number, since it is larger than the sum of its proper divisors (335643).

1321957 is a wasteful number, since it uses less digits than its factorization.

1321957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 1890, while the sum is 28.

The square root of 1321957 is about 1149.7638888050. The cubic root of 1321957 is about 109.7503152216.

It can be divided in two parts, 1321 and 957, that added together give a triangular number (2278 = T₆₇).

The spelling of 1321957 in words is "one million, three hundred twenty-one thousand, nine hundred fifty-seven".