1320990 has 32 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 320160.

The previous prime is 1320983. The next prime is 1321007. The reversal of 1320990 is 990231.

1320990 = 512² + 513² + ... + 516².

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1672 + ... + 2331.

It is an arithmetic number, because the mean of its divisors is an integer number (108108).

2^1320990 is an apocalyptic number.

1320990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1320990 is an abundant number, since it is smaller than the sum of its proper divisors (2138466).

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

1320990 is a wasteful number, since it uses less digits than its factorization.

1320990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 1320990 is about 1149.3432907535. The cubic root of 1320990 is about 109.7235482283.

The spelling of 1320990 in words is "one million, three hundred twenty thousand, nine hundred ninety".