142689406 has 4 divisors (see below), whose sum is σ = 214034112. Its totient is φ = 71344702.

The previous prime is 142689397. The next prime is 142689451. The reversal of 142689406 is 604986241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604986241 = 139 ⋅4352419.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35672350 + ... + 35672353.

It is an arithmetic number, because the mean of its divisors is an integer number (53508528).

Almost surely, 2^142689406 is an apocalyptic number.

142689406 is a deficient number, since it is larger than the sum of its proper divisors (71344706).

142689406 is an equidigital number, since it uses as much as digits as its factorization.

142689406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71344705.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 142689406 is about 11945.2670962185. The cubic root of 142689406 is about 522.5532782984.

The spelling of 142689406 in words is "one hundred forty-two million, six hundred eighty-nine thousand, four hundred six".