142977293 has 4 divisors (see below), whose sum is σ = 151387740. Its totient is φ = 134566848.

The previous prime is 142977283. The next prime is 142977311. The reversal of 142977293 is 392779241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 392779241 = 2251 ⋅174491.

It can be written as a sum of positive squares in 2 ways, for example, as 75030244 + 67947049 = 8662^2 + 8243^2 .

It is a cyclic number.

It is not a de Polignac number, because 142977293 - 2⁴ = 142977277 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 (142977203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4205198 + ... + 4205231.

It is an arithmetic number, because the mean of its divisors is an integer number (37846935).

Almost surely, 2^142977293 is an apocalyptic number.

It is an amenable number.

142977293 is a deficient number, since it is larger than the sum of its proper divisors (8410447).

142977293 is an equidigital number, since it uses as much as digits as its factorization.

142977293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8410446.

The product of its digits is 190512, while the sum is 44.

The square root of 142977293 is about 11957.3112780424. The cubic root of 142977293 is about 522.9044728750.

The spelling of 142977293 in words is "one hundred forty-two million, nine hundred seventy-seven thousand, two hundred ninety-three".