142939987 has 2 divisors, whose sum is σ = 142939988. Its totient is φ = 142939986.

The previous prime is 142939957. The next prime is 142940023. The reversal of 142939987 is 789939241.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142939987 is a prime.

It is not a weakly prime, because it can be changed into another prime (142939957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71469993 + 71469994.

It is an arithmetic number, because the mean of its divisors is an integer number (71469994).

Almost surely, 2^142939987 is an apocalyptic number.

142939987 is a deficient number, since it is larger than the sum of its proper divisors (1).

142939987 is an equidigital number, since it uses as much as digits as its factorization.

142939987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 142939987 is about 11955.7512101917. The cubic root of 142939987 is about 522.8589897293.

The spelling of 142939987 in words is "one hundred forty-two million, nine hundred thirty-nine thousand, nine hundred eighty-seven".