142278639 has 8 divisors (see below), whose sum is σ = 191384112. Its totient is φ = 94012800.

The previous prime is 142278637. The next prime is 142278641. The reversal of 142278639 is 936872241.

It is an interprime number because it is at equal distance from previous prime (142278637) and next prime (142278641).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 142278639 - 2¹ = 142278637 is a prime.

It is a super-2 number, since 2×142278639² = 40486422231384642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 142278639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142278637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209512 + ... + 210189.

It is an arithmetic number, because the mean of its divisors is an integer number (23923014).

Almost surely, 2^142278639 is an apocalyptic number.

142278639 is a deficient number, since it is larger than the sum of its proper divisors (49105473).

142278639 is a wasteful number, since it uses less digits than its factorization.

142278639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419817.

The product of its digits is 145152, while the sum is 42.

The square root of 142278639 is about 11928.0609907897. The cubic root of 142278639 is about 522.0513630996.

The spelling of 142278639 in words is "one hundred forty-two million, two hundred seventy-eight thousand, six hundred thirty-nine".