1340039428 has 48 divisors (see below), whose sum is σ = 2911870080. Its totient is φ = 525417984.

The previous prime is 1340039423. The next prime is 1340039461. The reversal of 1340039428 is 8249300431.

It is a junction number, because it is equal to n+sod(n) for n = 1340039393 and 1340039402.

It is not an unprimeable number, because it can be changed into a prime (1340039423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24843 + ... + 57421.

It is an arithmetic number, because the mean of its divisors is an integer number (60663960).

Almost surely, 2^1340039428 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 1340039428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455935040).

1340039428 is an abundant number, since it is smaller than the sum of its proper divisors (1571830652).

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

1340039428 is a wasteful number, since it uses less digits than its factorization.

1340039428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32716 (or 32714 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1340039428 is about 36606.5489769249. The cubic root of 1340039428 is about 1102.4845843626.

Adding to 1340039428 its reverse (8249300431), we get a palindrome (9589339859).

The spelling of 1340039428 in words is "one billion, three hundred forty million, thirty-nine thousand, four hundred twenty-eight".