142874209 has 3 divisors (see below), whose sum is σ = 142886163. Its totient is φ = 142862256.

The previous prime is 142874203. The next prime is 142874231. The reversal of 142874209 is 902478241.

The square root of 142874209 is 11953.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902478241 = 7 ⋅128925463.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 13483584 = 11375^2 + 3672^2 .

It is not a de Polignac number, because 142874209 - 2⁵ = 142874177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142874203) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5977 + ... + 17929.

It is an arithmetic number, because the mean of its divisors is an integer number (47628721).

Almost surely, 2^142874209 is an apocalyptic number.

142874209 is the 11953-rd square number.

142874209 is the 5977-th centered octagonal number.

It is an amenable number.

142874209 is a deficient number, since it is larger than the sum of its proper divisors (11954).

142874209 is an frugal number, since it uses more digits than its factorization.

142874209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23906 (or 11953 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The cubic root of 142874209 is about 522.7787744905.

It can be divided in two parts, 14287 and 4209, that added together give a square (18496 = 136²).

The spelling of 142874209 in words is "one hundred forty-two million, eight hundred seventy-four thousand, two hundred nine".