239858001009 has 189 divisors, whose sum is σ = 424281086481. Its totient is φ = 135406909440.

The previous prime is 239858001007. The next prime is 239858001011. The reversal of 239858001009 is 900100858932.

It is a happy number.

The square root of 239858001009 is 489753.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (239858001007) and next prime (239858001011).

It can be written as a sum of positive squares in 4 ways, for example, as 14042961009 + 225815040000 = 118503^2 + 475200^2 .

It is not a de Polignac number, because 239858001009 - 2¹ = 239858001007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (239858001007) by changing a digit.

It is a polite number, since it can be written in 188 ways as a sum of consecutive naturals, for example, 2472762849 + ... + 2472762945.

Almost surely, 2^239858001009 is an apocalyptic number.

239858001009 is the 489753-rd square number.

239858001009 is the 244877-th centered octagonal number.

It is an amenable number.

239858001009 is a deficient number, since it is larger than the sum of its proper divisors (184423085472).

239858001009 is an frugal number, since it uses more digits than its factorization.

239858001009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 239858001009 in words is "two hundred thirty-nine billion, eight hundred fifty-eight million, one thousand, nine".