239628457 has 2 divisors, whose sum is σ = 239628458. Its totient is φ = 239628456.

The previous prime is 239628451. The next prime is 239628461. The reversal of 239628457 is 754826932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206669376 + 32959081 = 14376^2 + 5741^2 .

It is a cyclic number.

It is not a de Polignac number, because 239628457 - 2¹⁵ = 239595689 is a prime.

It is not a weakly prime, because it can be changed into another prime (239628451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119814228 + 119814229.

It is an arithmetic number, because the mean of its divisors is an integer number (119814229).

Almost surely, 2^239628457 is an apocalyptic number.

It is an amenable number.

239628457 is a deficient number, since it is larger than the sum of its proper divisors (1).

239628457 is an equidigital number, since it uses as much as digits as its factorization.

239628457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 239628457 is about 15479.9372414749. The cubic root of 239628457 is about 621.1256493176.

The spelling of 239628457 in words is "two hundred thirty-nine million, six hundred twenty-eight thousand, four hundred fifty-seven".