1345642123 has 16 divisors (see below), whose sum is σ = 1631171520. Its totient is φ = 1083672576.

The previous prime is 1345642121. The next prime is 1345642139. The reversal of 1345642123 is 3212465431.

It is not a de Polignac number, because 1345642123 - 2¹ = 1345642121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345642121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61033 + ... + 80101.

It is an arithmetic number, because the mean of its divisors is an integer number (101948220).

Almost surely, 2^1345642123 is an apocalyptic number.

1345642123 is a deficient number, since it is larger than the sum of its proper divisors (285529397).

1345642123 is a wasteful number, since it uses less digits than its factorization.

1345642123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19686.

The product of its digits is 17280, while the sum is 31.

The square root of 1345642123 is about 36682.9950113128. The cubic root of 1345642123 is about 1104.0189412817.

The spelling of 1345642123 in words is "one billion, three hundred forty-five million, six hundred forty-two thousand, one hundred twenty-three".