142389787 has 2 divisors, whose sum is σ = 142389788. Its totient is φ = 142389786.

The previous prime is 142389713. The next prime is 142389881. The reversal of 142389787 is 787983241.

142389787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142389787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142389787.

It is not a weakly prime, because it can be changed into another prime (142389707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71194893 + 71194894.

It is an arithmetic number, because the mean of its divisors is an integer number (71194894).

Almost surely, 2^142389787 is an apocalyptic number.

142389787 is a deficient number, since it is larger than the sum of its proper divisors (1).

142389787 is an equidigital number, since it uses as much as digits as its factorization.

142389787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 142389787 is about 11932.7191787958. The cubic root of 142389787 is about 522.1872698016.

It can be divided in two parts, 14238 and 9787, that added together give a square (24025 = 155²).

The spelling of 142389787 in words is "one hundred forty-two million, three hundred eighty-nine thousand, seven hundred eighty-seven".