1340046251 has 4 divisors (see below), whose sum is σ = 1349040000. Its totient is φ = 1331052504.

The previous prime is 1340046247. The next prime is 1340046277. The reversal of 1340046251 is 1526400431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1526400431 = 23071 ⋅66161.

It is a cyclic number.

It is not a de Polignac number, because 1340046251 - 2² = 1340046247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340046251.

It is not an unprimeable number, because it can be changed into a prime (1340046221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496651 + ... + 4496948.

It is an arithmetic number, because the mean of its divisors is an integer number (337260000).

Almost surely, 2^1340046251 is an apocalyptic number.

1340046251 is a deficient number, since it is larger than the sum of its proper divisors (8993749).

1340046251 is an equidigital number, since it uses as much as digits as its factorization.

1340046251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8993748.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1340046251 is about 36606.6421705133. The cubic root of 1340046251 is about 1102.4864555114.

Adding to 1340046251 its reverse (1526400431), we get a palindrome (2866446682).

The spelling of 1340046251 in words is "one billion, three hundred forty million, forty-six thousand, two hundred fifty-one".