142978777 has 2 divisors, whose sum is σ = 142978778. Its totient is φ = 142978776.

The previous prime is 142978763. The next prime is 142978799. The reversal of 142978777 is 777879241.

It is a happy number.

142978777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127486681 + 15492096 = 11291^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 142978777 - 2¹⁵ = 142946009 is a prime.

It is not a weakly prime, because it can be changed into another prime (142970777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71489388 + 71489389.

It is an arithmetic number, because the mean of its divisors is an integer number (71489389).

Almost surely, 2^142978777 is an apocalyptic number.

It is an amenable number.

142978777 is a deficient number, since it is larger than the sum of its proper divisors (1).

142978777 is an equidigital number, since it uses as much as digits as its factorization.

142978777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976, while the sum is 52.

The square root of 142978777 is about 11957.3733319655. The cubic root of 142978777 is about 522.9062819911.

The spelling of 142978777 in words is "one hundred forty-two million, nine hundred seventy-eight thousand, seven hundred seventy-seven".