1321956 has 18 divisors (see below), whose sum is σ = 3341702. Its totient is φ = 440640.

The previous prime is 1321951. The next prime is 1321961. The reversal of 1321956 is 6591231.

It is an interprime number because it is at equal distance from previous prime (1321951) and next prime (1321961).

It can be written as a sum of positive squares in only one way, i.e., 665856 + 656100 = 816^2 + 810^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18325 + ... + 18396.

2^1321956 is an apocalyptic number.

It is an amenable number.

1321956 is an abundant number, since it is smaller than the sum of its proper divisors (2019746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321956 is a wasteful number, since it uses less digits than its factorization.

1321956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36731 (or 36726 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 1321956 is about 1149.7634539330. The cubic root of 1321956 is about 109.7502875479.

It can be divided in two parts, 132195 and 6, that multiplied together give a triangular number (793170 = T₁₂₅₉).

The spelling of 1321956 in words is "one million, three hundred twenty-one thousand, nine hundred fifty-six".