1345721766 has 32 divisors (see below), whose sum is σ = 2868231168. Its totient is φ = 419939520.

The previous prime is 1345721761. The next prime is 1345721801. The reversal of 1345721766 is 6671275431.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345721761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97255 + ... + 110226.

It is an arithmetic number, because the mean of its divisors is an integer number (89632224).

Almost surely, 2^1345721766 is an apocalyptic number.

1345721766 is an abundant number, since it is smaller than the sum of its proper divisors (1522509402).

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

1345721766 is a wasteful number, since it uses less digits than its factorization.

1345721766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207556.

The product of its digits is 211680, while the sum is 42.

The square root of 1345721766 is about 36684.0805527411. The cubic root of 1345721766 is about 1104.0407216260.

The spelling of 1345721766 in words is "one billion, three hundred forty-five million, seven hundred twenty-one thousand, seven hundred sixty-six".