142738421 has 8 divisors (see below), whose sum is σ = 166459200. Its totient is φ = 122346924.

The previous prime is 142738417. The next prime is 142738423. The reversal of 142738421 is 124837241.

It is not a de Polignac number, because 142738421 - 2² = 142738417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142738423) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 207731 + ... + 208416.

It is an arithmetic number, because the mean of its divisors is an integer number (20807400).

Almost surely, 2^142738421 is an apocalyptic number.

It is an amenable number.

142738421 is a deficient number, since it is larger than the sum of its proper divisors (23720779).

142738421 is an frugal number, since it uses more digits than its factorization.

142738421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416168 (or 416154 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 142738421 is about 11947.3185694531. The cubic root of 142738421 is about 522.6131052505.

The spelling of 142738421 in words is "one hundred forty-two million, seven hundred thirty-eight thousand, four hundred twenty-one".