1340240521 has 8 divisors (see below), whose sum is σ = 1424900160. Its totient is φ = 1257779952.

The previous prime is 1340240497. The next prime is 1340240557. The reversal of 1340240521 is 1250420431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1340240521 - 2⁹ = 1340240009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1340240492 and 1340240501.

It is not an unprimeable number, because it can be changed into a prime (1340240581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548511 + ... + 550948.

It is an arithmetic number, because the mean of its divisors is an integer number (178112520).

Almost surely, 2^1340240521 is an apocalyptic number.

It is an amenable number.

1340240521 is a deficient number, since it is larger than the sum of its proper divisors (84659639).

1340240521 is a wasteful number, since it uses less digits than its factorization.

1340240521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099535.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1340240521 is about 36609.2955545446. The cubic root of 1340240521 is about 1102.5397297160.

Adding to 1340240521 its reverse (1250420431), we get a palindrome (2590660952).

The spelling of 1340240521 in words is "one billion, three hundred forty million, two hundred forty thousand, five hundred twenty-one".