1340521404 has 96 divisors (see below), whose sum is σ = 3386880000. Its totient is φ = 411747840.

The previous prime is 1340521381. The next prime is 1340521409. The reversal of 1340521404 is 4041250431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340521409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 669597 + ... + 671595.

It is an arithmetic number, because the mean of its divisors is an integer number (35280000).

Almost surely, 2^1340521404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1340521404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1693440000).

1340521404 is an abundant number, since it is smaller than the sum of its proper divisors (2046358596).

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

1340521404 is a wasteful number, since it uses less digits than its factorization.

1340521404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1340521404 is about 36613.1315787109. The cubic root of 1340521404 is about 1102.6167464977.

Adding to 1340521404 its reverse (4041250431), we get a palindrome (5381771835).

The spelling of 1340521404 in words is "one billion, three hundred forty million, five hundred twenty-one thousand, four hundred four".