395985157 has 2 divisors, whose sum is σ = 395985158. Its totient is φ = 395985156.

The previous prime is 395985113. The next prime is 395985173. The reversal of 395985157 is 751589593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391683681 + 4301476 = 19791^2 + 2074^2 .

It is a cyclic number.

It is not a de Polignac number, because 395985157 - 2¹⁹ = 395460869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395925157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197992578 + 197992579.

It is an arithmetic number, because the mean of its divisors is an integer number (197992579).

Almost surely, 2^395985157 is an apocalyptic number.

It is an amenable number.

395985157 is a deficient number, since it is larger than the sum of its proper divisors (1).

395985157 is an equidigital number, since it uses as much as digits as its factorization.

395985157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 52.

The square root of 395985157 is about 19899.3757942303. The cubic root of 395985157 is about 734.3328711417.

The spelling of 395985157 in words is "three hundred ninety-five million, nine hundred eighty-five thousand, one hundred fifty-seven".