142278399 has 6 divisors (see below), whose sum is σ = 205513256. Its totient is φ = 94852260.

The previous prime is 142278361. The next prime is 142278407. The reversal of 142278399 is 993872241.

It is not a de Polignac number, because 142278399 - 2¹² = 142274303 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 (142278359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7904347 + ... + 7904364.

Almost surely, 2^142278399 is an apocalyptic number.

142278399 is a deficient number, since it is larger than the sum of its proper divisors (63234857).

142278399 is a wasteful number, since it uses less digits than its factorization.

142278399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15808717 (or 15808714 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 142278399 is about 11928.0509304748. The cubic root of 142278399 is about 522.0510695620.

The spelling of 142278399 in words is "one hundred forty-two million, two hundred seventy-eight thousand, three hundred ninety-nine".