142191239 has 16 divisors (see below), whose sum is σ = 151683840. Its totient is φ = 133103040.

The previous prime is 142191229. The next prime is 142191277. The reversal of 142191239 is 932191241.

142191239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142191239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142191229) 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, 103334 + ... + 104700.

It is an arithmetic number, because the mean of its divisors is an integer number (9480240).

Almost surely, 2^142191239 is an apocalyptic number.

142191239 is a deficient number, since it is larger than the sum of its proper divisors (9492601).

142191239 is a wasteful number, since it uses less digits than its factorization.

142191239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510.

The product of its digits is 3888, while the sum is 32.

The square root of 142191239 is about 11924.3967981613. The cubic root of 142191239 is about 521.9444446486.

The spelling of 142191239 in words is "one hundred forty-two million, one hundred ninety-one thousand, two hundred thirty-nine".