142289388 has 36 divisors (see below), whose sum is σ = 380835000. Its totient is φ = 44639616.

The previous prime is 142289299. The next prime is 142289417. The reversal of 142289388 is 883982241.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115638 + ... + 116861.

It is an arithmetic number, because the mean of its divisors is an integer number (10578750).

Almost surely, 2^142289388 is an apocalyptic number.

142289388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

142289388 is an abundant number, since it is smaller than the sum of its proper divisors (238545612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

142289388 is a wasteful number, since it uses less digits than its factorization.

142289388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232526 (or 232521 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 142289388 is about 11928.5115584468. The cubic root of 142289388 is about 522.0645095771.

The spelling of 142289388 in words is "one hundred forty-two million, two hundred eighty-nine thousand, three hundred eighty-eight".