1321945 has 8 divisors (see below), whose sum is σ = 1592640. Its totient is φ = 1053360.

The previous prime is 1321939. The next prime is 1321951. The reversal of 1321945 is 5491231.

It is an interprime number because it is at equal distance from previous prime (1321939) and next prime (1321951).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321945 - 2¹⁷ = 1190873 is a prime.

1321945 is a lucky 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, 1780 + ... + 2410.

It is an arithmetic number, because the mean of its divisors is an integer number (199080).

2^1321945 is an apocalyptic number.

It is an amenable number.

1321945 is a deficient number, since it is larger than the sum of its proper divisors (270695).

1321945 is an equidigital number, since it uses as much as digits as its factorization.

1321945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055.

The product of its digits is 1080, while the sum is 25.

The square root of 1321945 is about 1149.7586703304. The cubic root of 1321945 is about 109.7499831362.

The spelling of 1321945 in words is "one million, three hundred twenty-one thousand, nine hundred forty-five".