1340388 has 72 divisors (see below), whose sum is σ = 4036032. Its totient is φ = 381024.

The previous prime is 1340387. The next prime is 1340401. The reversal of 1340388 is 8830431.

1340388 is nontrivially palindromic in base 5.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1340387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6706 + ... + 6902.

It is an arithmetic number, because the mean of its divisors is an integer number (56056).

2^1340388 is an apocalyptic number.

1340388 is a gapful number since it is divisible by the number (18) 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 1340388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2018016).

1340388 is an abundant number, since it is smaller than the sum of its proper divisors (2695644).

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

1340388 is a wasteful number, since it uses less digits than its factorization.

1340388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1340388 is about 1157.7512686238. The cubic root of 1340388 is about 110.2580169097.

It can be divided in two parts, 1340 and 388, that added together give a cube (1728 = 12³).

The spelling of 1340388 in words is "one million, three hundred forty thousand, three hundred eighty-eight".