1312690 has 16 divisors (see below), whose sum is σ = 2381400. Its totient is φ = 520960.

The previous prime is 1312681. The next prime is 1312733. The reversal of 1312690 is 962131.

It can be written as a sum of positive squares in 4 ways, for example, as 561001 + 751689 = 749^2 + 867^2 .

It is a super-2 number, since 2×1312690² = 3446310072200, which contains 22 as substring.

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, 1050 + ... + 1930.

2^1312690 is an apocalyptic number.

1312690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1312690 is a deficient number, since it is larger than the sum of its proper divisors (1068710).

1312690 is a wasteful number, since it uses less digits than its factorization.

1312690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1312690 is about 1145.7268435365. The cubic root of 1312690 is about 109.4932614717.

It can be divided in two parts, 1312 and 690, that added together give a palindrome (2002).

The spelling of 1312690 in words is "one million, three hundred twelve thousand, six hundred ninety".