345072139 has 4 divisors (see below), whose sum is σ = 345119056. Its totient is φ = 345025224.

The previous prime is 345072127. The next prime is 345072149. The reversal of 345072139 is 931270543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931270543 = 7 ⋅133038649.

It is a cyclic number.

It is not a de Polignac number, because 345072139 - 2⁵ = 345072107 is a prime.

It is a super-2 number, since 2×345072139² = 238149562228070642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345072109) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 9759 + ... + 28024.

It is an arithmetic number, because the mean of its divisors is an integer number (86279764).

Almost surely, 2^345072139 is an apocalyptic number.

345072139 is a deficient number, since it is larger than the sum of its proper divisors (46917).

345072139 is an equidigital number, since it uses as much as digits as its factorization.

345072139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46916.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 345072139 is about 18576.1174361060. The cubic root of 345072139 is about 701.4067892505.

The spelling of 345072139 in words is "three hundred forty-five million, seventy-two thousand, one hundred thirty-nine".