238815457 has 2 divisors, whose sum is σ = 238815458. Its totient is φ = 238815456.

The previous prime is 238815433. The next prime is 238815461. The reversal of 238815457 is 754518832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154157056 + 84658401 = 12416^2 + 9201^2 .

It is a cyclic number.

It is not a de Polignac number, because 238815457 - 2²³ = 230426849 is a prime.

It is not a weakly prime, because it can be changed into another prime (238815487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119407728 + 119407729.

It is an arithmetic number, because the mean of its divisors is an integer number (119407729).

Almost surely, 2^238815457 is an apocalyptic number.

It is an amenable number.

238815457 is a deficient number, since it is larger than the sum of its proper divisors (1).

238815457 is an equidigital number, since it uses as much as digits as its factorization.

238815457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268800, while the sum is 43.

The square root of 238815457 is about 15453.6551339804. The cubic root of 238815457 is about 620.4224115868.

The spelling of 238815457 in words is "two hundred thirty-eight million, eight hundred fifteen thousand, four hundred fifty-seven".