142401989 has 2 divisors, whose sum is σ = 142401990. Its totient is φ = 142401988.

The previous prime is 142401967. The next prime is 142401991. The reversal of 142401989 is 989104241.

142401989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138532900 + 3869089 = 11770^2 + 1967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142401989 is a prime.

It is a super-2 number, since 2×142401989² = 40556652942312242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 142401991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142404989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71200994 + 71200995.

It is an arithmetic number, because the mean of its divisors is an integer number (71200995).

Almost surely, 2^142401989 is an apocalyptic number.

It is an amenable number.

142401989 is a deficient number, since it is larger than the sum of its proper divisors (1).

142401989 is an equidigital number, since it uses as much as digits as its factorization.

142401989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 142401989 is about 11933.2304511394. The cubic root of 142401989 is about 522.2021855415.

The spelling of 142401989 in words is "one hundred forty-two million, four hundred one thousand, nine hundred eighty-nine".