142990809 has 16 divisors (see below), whose sum is σ = 206688384. Its totient is φ = 87408000.

The previous prime is 142990787. The next prime is 142990877. The reversal of 142990809 is 908099241.

It is not a de Polignac number, because 142990809 - 2¹¹ = 142988761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142990709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6252 + ... + 18029.

It is an arithmetic number, because the mean of its divisors is an integer number (12918024).

Almost surely, 2^142990809 is an apocalyptic number.

It is an amenable number.

142990809 is a deficient number, since it is larger than the sum of its proper divisors (63697575).

142990809 is a wasteful number, since it uses less digits than its factorization.

142990809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24448.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 142990809 is about 11957.8764419106. The cubic root of 142990809 is about 522.9209495103.

The spelling of 142990809 in words is "one hundred forty-two million, nine hundred ninety thousand, eight hundred nine".