1316640 has 96 divisors (see below), whose sum is σ = 4487616. Its totient is φ = 322560.

The previous prime is 1316639. The next prime is 1316647. The reversal of 1316640 is 466131.

1316640 = T₁₇₀ + T₁₇₁ + ... + T₂₃₃.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1316647) 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 15 ways as a sum of consecutive naturals, for example, 6135 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (46746).

2^1316640 is an apocalyptic number.

1316640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1316640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243808).

1316640 is an abundant number, since it is smaller than the sum of its proper divisors (3170976).

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

1316640 is a wasteful number, since it uses less digits than its factorization.

1316640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1316640 is about 1147.4493452872. The cubic root of 1316640 is about 109.6029764585.

It can be divided in two parts, 13 and 16640, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 1316640 in words is "one million, three hundred sixteen thousand, six hundred forty".