143240857 has 2 divisors, whose sum is σ = 143240858. Its totient is φ = 143240856.

The previous prime is 143240837. The next prime is 143240873. The reversal of 143240857 is 758042341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83704201 + 59536656 = 9149^2 + 7716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143240857 is a prime.

It is a super-2 number, since 2×143240857² = 41035886228188898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (143240807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71620428 + 71620429.

It is an arithmetic number, because the mean of its divisors is an integer number (71620429).

Almost surely, 2^143240857 is an apocalyptic number.

It is an amenable number.

143240857 is a deficient number, since it is larger than the sum of its proper divisors (1).

143240857 is an equidigital number, since it uses as much as digits as its factorization.

143240857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 143240857 is about 11968.3272431865. The cubic root of 143240857 is about 523.2255825964.

The spelling of 143240857 in words is "one hundred forty-three million, two hundred forty thousand, eight hundred fifty-seven".