1311990 has 32 divisors (see below), whose sum is σ = 3187296. Its totient is φ = 345600.

The previous prime is 1311971. The next prime is 1311991. The reversal of 1311990 is 991131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311991) 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, 2814 + ... + 3246.

It is an arithmetic number, because the mean of its divisors is an integer number (99603).

2^1311990 is an apocalyptic number.

1311990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311990 is an abundant number, since it is smaller than the sum of its proper divisors (1875306).

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

1311990 is a wasteful number, since it uses less digits than its factorization.

1311990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 1311990 is about 1145.4213198644. The cubic root of 1311990 is about 109.4737953599.

The spelling of 1311990 in words is "one million, three hundred eleven thousand, nine hundred ninety".