1317690 has 60 divisors (see below), whose sum is σ = 3768570. Its totient is φ = 319440.

The previous prime is 1317683. The next prime is 1317691. The reversal of 1317690 is 967131.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 131769 = 1089^2 + 363^2 .

It is a super-2 number, since 2×1317690² = 3472613872200, which contains 22 as substring.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1317691) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 119785 + ... + 119795.

2^1317690 is an apocalyptic number.

1317690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1317690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1884285).

1317690 is an abundant number, since it is smaller than the sum of its proper divisors (2450880).

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

1317690 is an equidigital number, since it uses as much as digits as its factorization.

1317690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 1317690 is about 1147.9067906411. The cubic root of 1317690 is about 109.6321042754.

The spelling of 1317690 in words is "one million, three hundred seventeen thousand, six hundred ninety".