142778123 has 2 divisors, whose sum is σ = 142778124. Its totient is φ = 142778122.

The previous prime is 142778101. The next prime is 142778137. The reversal of 142778123 is 321877241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 142778123 - 2²⁴ = 126000907 is a prime.

It is not a weakly prime, because it can be changed into another prime (142778143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71389061 + 71389062.

It is an arithmetic number, because the mean of its divisors is an integer number (71389062).

Almost surely, 2^142778123 is an apocalyptic number.

142778123 is a deficient number, since it is larger than the sum of its proper divisors (1).

142778123 is an equidigital number, since it uses as much as digits as its factorization.

142778123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 35.

The square root of 142778123 is about 11948.9799983095. The cubic root of 142778123 is about 522.6615548595.

The spelling of 142778123 in words is "one hundred forty-two million, seven hundred seventy-eight thousand, one hundred twenty-three".