142306438 has 4 divisors (see below), whose sum is σ = 213459660. Its totient is φ = 71153218.

The previous prime is 142306429. The next prime is 142306453. The reversal of 142306438 is 834603241.

142306438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834603241 = 3469 ⋅240589.

It is a super-2 number, since 2×142306438² = 40502244592495688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35576608 + ... + 35576611.

It is an arithmetic number, because the mean of its divisors is an integer number (53364915).

Almost surely, 2^142306438 is an apocalyptic number.

142306438 is a deficient number, since it is larger than the sum of its proper divisors (71153222).

142306438 is an equidigital number, since it uses as much as digits as its factorization.

142306438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71153221.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 142306438 is about 11929.2262112846. The cubic root of 142306438 is about 522.0853610838.

Adding to 142306438 its reverse (834603241), we get a palindrome (976909679).

The spelling of 142306438 in words is "one hundred forty-two million, three hundred six thousand, four hundred thirty-eight".