142209509 has 8 divisors (see below), whose sum is σ = 161209440. Its totient is φ = 124361136.

The previous prime is 142209497. The next prime is 142209563. The reversal of 142209509 is 905902241.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142209509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142209409) 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, 287627 + ... + 288120.

It is an arithmetic number, because the mean of its divisors is an integer number (20151180).

Almost surely, 2^142209509 is an apocalyptic number.

142209509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

142209509 is a deficient number, since it is larger than the sum of its proper divisors (18999931).

142209509 is a wasteful number, since it uses less digits than its factorization.

142209509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575779.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 142209509 is about 11925.1628500411. The cubic root of 142209509 is about 521.9667983854.

The spelling of 142209509 in words is "one hundred forty-two million, two hundred nine thousand, five hundred nine".