1321970 has 16 divisors (see below), whose sum is σ = 2562840. Its totient is φ = 488064.

The previous prime is 1321961. The next prime is 1321981. The reversal of 1321970 is 791231.

It can be written as a sum of positive squares in 4 ways, for example, as 1125721 + 196249 = 1061^2 + 443^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4955 + ... + 5214.

2^1321970 is an apocalyptic number.

1321970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321970 is a deficient number, since it is larger than the sum of its proper divisors (1240870).

1321970 is a wasteful number, since it uses less digits than its factorization.

1321970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10189.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 1321970 is about 1149.7695421257. The cubic root of 1321970 is about 109.7506749785.

The spelling of 1321970 in words is "one million, three hundred twenty-one thousand, nine hundred seventy".