142049809 has 8 divisors (see below), whose sum is σ = 155057760. Its totient is φ = 129057600.

The previous prime is 142049783. The next prime is 142049819. The reversal of 142049809 is 908940241.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 142049809 - 2¹¹ = 142047761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142049819) 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 7 ways as a sum of consecutive naturals, for example, 22969 + ... + 28489.

It is an arithmetic number, because the mean of its divisors is an integer number (19382220).

Almost surely, 2^142049809 is an apocalyptic number.

It is an amenable number.

142049809 is a deficient number, since it is larger than the sum of its proper divisors (13007951).

142049809 is a wasteful number, since it uses less digits than its factorization.

142049809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7871.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 142049809 is about 11918.4650437881. The cubic root of 142049809 is about 521.7713371929.

The spelling of 142049809 in words is "one hundred forty-two million, forty-nine thousand, eight hundred nine".