239819661 has 12 divisors (see below), whose sum is σ = 347516988. Its totient is φ = 159367104.

The previous prime is 239819659. The next prime is 239819669. The reversal of 239819661 is 166918932.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 227074761 = 3570^2 + 15069^2 .

It is not a de Polignac number, because 239819661 - 2¹ = 239819659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239819669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39750 + ... + 45383.

It is an arithmetic number, because the mean of its divisors is an integer number (28959749).

Almost surely, 2^239819661 is an apocalyptic number.

It is an amenable number.

239819661 is a deficient number, since it is larger than the sum of its proper divisors (107697327).

239819661 is a wasteful number, since it uses less digits than its factorization.

239819661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85452 (or 85449 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 239819661 is about 15486.1118748380. Note that the first 3 decimals coincide. The cubic root of 239819661 is about 621.2908079646.

The spelling of 239819661 in words is "two hundred thirty-nine million, eight hundred nineteen thousand, six hundred sixty-one".