1317990 has 16 divisors (see below), whose sum is σ = 3163248. Its totient is φ = 351456.

The previous prime is 1317989. The next prime is 1318003. The reversal of 1317990 is 997131.

1317990 is nontrivially palindromic in base 14.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 43933 = 1317990 / (1 + 3 + 1 + 7 + 9 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21937 + ... + 21996.

It is an arithmetic number, because the mean of its divisors is an integer number (197703).

2^1317990 is an apocalyptic number.

1317990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1317990 is an abundant number, since it is smaller than the sum of its proper divisors (1845258).

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

1317990 is a wasteful number, since it uses less digits than its factorization.

1317990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43943.

The product of its (nonzero) digits is 1701, while the sum is 30.

The square root of 1317990 is about 1148.0374558350. The cubic root of 1317990 is about 109.6404236665.

The spelling of 1317990 in words is "one million, three hundred seventeen thousand, nine hundred ninety".