342139009 has 9 divisors (see below), whose sum is σ = 349718313. Its totient is φ = 334721712.

The previous prime is 342139001. The next prime is 342139069. The reversal of 342139009 is 900931243.

342139009 = 322² + 323² + ... + 1019².

The square root of 342139009 is 18497.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 70812225 + 271326784 = 8415^2 + 16472^2 .

It is not a de Polignac number, because 342139009 - 2³ = 342139001 is a prime.

It is a super-3 number, since 3×342139009³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342139001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 980167 + ... + 980515.

Almost surely, 2^342139009 is an apocalyptic number.

342139009 is the 18497-th square number.

342139009 is the 9249-th centered octagonal number.

It is an amenable number.

342139009 is a deficient number, since it is larger than the sum of its proper divisors (7579304).

342139009 is an frugal number, since it uses more digits than its factorization.

342139009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The cubic root of 342139009 is about 699.4138010749.

The spelling of 342139009 in words is "three hundred forty-two million, one hundred thirty-nine thousand, nine".