1340640 has 216 divisors, whose sum is σ = 5601960. Its totient is φ = 290304.

The previous prime is 1340639. The next prime is 1340653. The reversal of 1340640 is 460431.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70551 + ... + 70569.

It is an arithmetic number, because the mean of its divisors is an integer number (25935).

2^1340640 is an apocalyptic number.

1340640 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 1340640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2800980).

1340640 is an abundant number, since it is smaller than the sum of its proper divisors (4261320).

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

1340640 is a wasteful number, since it uses less digits than its factorization.

1340640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1340640 is about 1157.8600951756. The cubic root of 1340640 is about 110.2649261726.

The spelling of 1340640 in words is "one million, three hundred forty thousand, six hundred forty".