1340402521 has 8 divisors (see below), whose sum is σ = 1388793600. Its totient is φ = 1292333520.

The previous prime is 1340402507. The next prime is 1340402537. The reversal of 1340402521 is 1252040431.

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 1340402521 - 2²⁹ = 803531609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1340402492 and 1340402501.

It is not an unprimeable number, because it can be changed into a prime (1340402501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72031 + ... + 88708.

It is an arithmetic number, because the mean of its divisors is an integer number (173599200).

Almost surely, 2^1340402521 is an apocalyptic number.

It is an amenable number.

1340402521 is a deficient number, since it is larger than the sum of its proper divisors (48391079).

1340402521 is a wasteful number, since it uses less digits than its factorization.

1340402521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161039.

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

The square root of 1340402521 is about 36611.5080405055. The cubic root of 1340402521 is about 1102.5841506582.

Adding to 1340402521 its reverse (1252040431), we get a palindrome (2592442952).

The spelling of 1340402521 in words is "one billion, three hundred forty million, four hundred two thousand, five hundred twenty-one".