1345748209 has 8 divisors (see below), whose sum is σ = 1449833000. Its totient is φ = 1241744256.

The previous prime is 1345748191. The next prime is 1345748279. The reversal of 1345748209 is 9028475431.

It can be written as a sum of positive squares in 4 ways, for example, as 28058209 + 1317690000 = 5297^2 + 36300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1345748209 - 2¹³ = 1345740017 is a prime.

It is a super-2 number, since 2×1345748209² = 3622076484053415362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345748279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16909 + ... + 54565.

It is an arithmetic number, because the mean of its divisors is an integer number (181229125).

Almost surely, 2^1345748209 is an apocalyptic number.

It is an amenable number.

1345748209 is a deficient number, since it is larger than the sum of its proper divisors (104084791).

1345748209 is a wasteful number, since it uses less digits than its factorization.

1345748209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40419.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1345748209 is about 36684.4409661644. The cubic root of 1345748209 is about 1104.0479529270.

The spelling of 1345748209 in words is "one billion, three hundred forty-five million, seven hundred forty-eight thousand, two hundred nine".