1340507951 has 4 divisors (see below), whose sum is σ = 1340816400. Its totient is φ = 1340199504.

The previous prime is 1340507947. The next prime is 1340508019. The reversal of 1340507951 is 1597050431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1340507951 - 2² = 1340507947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340507911) 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 3 ways as a sum of consecutive naturals, for example, 147611 + ... + 156428.

It is an arithmetic number, because the mean of its divisors is an integer number (335204100).

Almost surely, 2^1340507951 is an apocalyptic number.

1340507951 is a deficient number, since it is larger than the sum of its proper divisors (308449).

1340507951 is an equidigital number, since it uses as much as digits as its factorization.

1340507951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308448.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 1340507951 is about 36612.9478600126. The cubic root of 1340507951 is about 1102.6130579945.

The spelling of 1340507951 in words is "one billion, three hundred forty million, five hundred seven thousand, nine hundred fifty-one".