1321390 has 32 divisors (see below), whose sum is σ = 2787840. Its totient is φ = 441504.

The previous prime is 1321379. The next prime is 1321391. The reversal of 1321390 is 931231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 3229.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2^1321390 is an apocalyptic number.

1321390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1321390 is an abundant number, since it is smaller than the sum of its proper divisors (1466450).

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

1321390 is a wasteful number, since it uses less digits than its factorization.

1321390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 1321390 is about 1149.5172899961. The cubic root of 1321390 is about 109.7346219911.

It can be divided in two parts, 1321 and 390, that added together give a triangular number (1711 = T₅₈).

The spelling of 1321390 in words is "one million, three hundred twenty-one thousand, three hundred ninety".