1321880 has 32 divisors (see below), whose sum is σ = 3399840. Its totient is φ = 453120.

The previous prime is 1321867. The next prime is 1321891. The reversal of 1321880 is 881231.

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, 2081 + ... + 2640.

It is an arithmetic number, because the mean of its divisors is an integer number (106245).

2^1321880 is an apocalyptic number.

1321880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321880 is an abundant number, since it is smaller than the sum of its proper divisors (2077960).

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

1321880 is a wasteful number, since it uses less digits than its factorization.

1321880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739 (or 4735 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1321880 is about 1149.7304031815. The cubic root of 1321880 is about 109.7481843055.

It can be divided in two parts, 132 and 1880, that multiplied together give a triangular number (248160 = T₇₀₄).

The spelling of 1321880 in words is "one million, three hundred twenty-one thousand, eight hundred eighty".