142278646 has 4 divisors (see below), whose sum is σ = 213417972. Its totient is φ = 71139322.

The previous prime is 142278641. The next prime is 142278691. The reversal of 142278646 is 646872241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646872241 = 727 ⋅889783.

It is a junction number, because it is equal to n+sod(n) for n = 142278599 and 142278608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142278641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35569660 + ... + 35569663.

It is an arithmetic number, because the mean of its divisors is an integer number (53354493).

Almost surely, 2^142278646 is an apocalyptic number.

142278646 is a deficient number, since it is larger than the sum of its proper divisors (71139326).

142278646 is an equidigital number, since it uses as much as digits as its factorization.

142278646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71139325.

The product of its digits is 129024, while the sum is 40.

The square root of 142278646 is about 11928.0612842155. The cubic root of 142278646 is about 522.0513716611.

The spelling of 142278646 in words is "one hundred forty-two million, two hundred seventy-eight thousand, six hundred forty-six".