1345721396 has 6 divisors (see below), whose sum is σ = 2355012450. Its totient is φ = 672860696.

The previous prime is 1345721389. The next prime is 1345721441. The reversal of 1345721396 is 6931275431.

It can be written as a sum of positive squares in only one way, i.e., 1205061796 + 140659600 = 34714^2 + 11860^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 168215171 + ... + 168215178.

It is an arithmetic number, because the mean of its divisors is an integer number (392502075).

Almost surely, 2^1345721396 is an apocalyptic number.

It is an amenable number.

1345721396 is a deficient number, since it is larger than the sum of its proper divisors (1009291054).

1345721396 is a wasteful number, since it uses less digits than its factorization.

1345721396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336430353 (or 336430351 counting only the distinct ones).

The product of its digits is 136080, while the sum is 41.

The square root of 1345721396 is about 36684.0755096813. The cubic root of 1345721396 is about 1104.0406204423.

The spelling of 1345721396 in words is "one billion, three hundred forty-five million, seven hundred twenty-one thousand, three hundred ninety-six".