238985431 has 2 divisors, whose sum is σ = 238985432. Its totient is φ = 238985430.

The previous prime is 238985419. The next prime is 238985497. The reversal of 238985431 is 134589832.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 238985431 - 2¹³ = 238977239 is a prime.

It is a super-2 number, since 2×238985431² = 114228072460511522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238985731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119492715 + 119492716.

It is an arithmetic number, because the mean of its divisors is an integer number (119492716).

Almost surely, 2^238985431 is an apocalyptic number.

238985431 is a deficient number, since it is larger than the sum of its proper divisors (1).

238985431 is an equidigital number, since it uses as much as digits as its factorization.

238985431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 238985431 is about 15459.1536314250. The cubic root of 238985431 is about 620.5695693843.

The spelling of 238985431 in words is "two hundred thirty-eight million, nine hundred eighty-five thousand, four hundred thirty-one".