1345721744 has 10 divisors (see below), whose sum is σ = 2607335910. Its totient is φ = 672860864.

The previous prime is 1345721731. The next prime is 1345721761. The reversal of 1345721744 is 4471275431.

It can be written as a sum of positive squares in only one way, i.e., 1184736400 + 160985344 = 34420^2 + 12688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1345721698 and 1345721707.

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, 42053789 + ... + 42053820.

It is an arithmetic number, because the mean of its divisors is an integer number (260733591).

Almost surely, 2^1345721744 is an apocalyptic number.

It is an amenable number.

1345721744 is a deficient number, since it is larger than the sum of its proper divisors (1261614166).

1345721744 is an equidigital number, since it uses as much as digits as its factorization.

1345721744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84107617 (or 84107611 counting only the distinct ones).

The product of its digits is 94080, while the sum is 38.

The square root of 1345721744 is about 36684.0802528835. The cubic root of 1345721744 is about 1104.0407156096.

The spelling of 1345721744 in words is "one billion, three hundred forty-five million, seven hundred twenty-one thousand, seven hundred forty-four".