1331890 has 32 divisors (see below), whose sum is σ = 2799360. Its totient is φ = 446784.

The previous prime is 1331857. The next prime is 1331921. The reversal of 1331890 is 981331.

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, 3531 + ... + 3889.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

2^1331890 is an apocalyptic number.

1331890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1331890 is an abundant number, since it is smaller than the sum of its proper divisors (1467470).

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

1331890 is a wasteful number, since it uses less digits than its factorization.

1331890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1331890 is about 1154.0753874856. The cubic root of 1331890 is about 110.0245124436.

The spelling of 1331890 in words is "one million, three hundred thirty-one thousand, eight hundred ninety".