397242143 has 2 divisors, whose sum is σ = 397242144. Its totient is φ = 397242142.

The previous prime is 397242059. The next prime is 397242163. The reversal of 397242143 is 341242793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397242143 - 2¹² = 397238047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397242163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198621071 + 198621072.

It is an arithmetic number, because the mean of its divisors is an integer number (198621072).

Almost surely, 2^397242143 is an apocalyptic number.

397242143 is a deficient number, since it is larger than the sum of its proper divisors (1).

397242143 is an equidigital number, since it uses as much as digits as its factorization.

397242143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 35.

The square root of 397242143 is about 19930.9343233076. The cubic root of 397242143 is about 735.1090544217.

The spelling of 397242143 in words is "three hundred ninety-seven million, two hundred forty-two thousand, one hundred forty-three".