1311898 has 16 divisors (see below), whose sum is σ = 2278080. Its totient is φ = 554976.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311898 is 8981131.

It is not an unprimeable number, because it can be changed into a prime (1311899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598 + ... + 1726.

It is an arithmetic number, because the mean of its divisors is an integer number (142380).

2^1311898 is an apocalyptic number.

1311898 is a deficient number, since it is larger than the sum of its proper divisors (966182).

1311898 is a wasteful number, since it uses less digits than its factorization.

1311898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its digits is 1728, while the sum is 31.

The square root of 1311898 is about 1145.3811592653. The cubic root of 1311898 is about 109.4712364419.

It can be divided in two parts, 1311 and 898, that added together give a square (2209 = 47²).

The spelling of 1311898 in words is "one million, three hundred eleven thousand, eight hundred ninety-eight".