142489409 has 4 divisors (see below), whose sum is σ = 142674516. Its totient is φ = 142304304.

The previous prime is 142489397. The next prime is 142489421. The reversal of 142489409 is 904984241.

142489409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (142489397) and next prime (142489421).

It can be written as a sum of positive squares in 2 ways, for example, as 14799409 + 127690000 = 3847^2 + 11300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142489409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142489429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91394 + ... + 92939.

It is an arithmetic number, because the mean of its divisors is an integer number (35668629).

Almost surely, 2^142489409 is an apocalyptic number.

It is an amenable number.

142489409 is a deficient number, since it is larger than the sum of its proper divisors (185107).

142489409 is an equidigital number, since it uses as much as digits as its factorization.

142489409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185106.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 142489409 is about 11936.8927698962. The cubic root of 142489409 is about 522.3090229457.

The spelling of 142489409 in words is "one hundred forty-two million, four hundred eighty-nine thousand, four hundred nine".