239649819 has 4 divisors (see below), whose sum is σ = 319533096. Its totient is φ = 159766544.

The previous prime is 239649769. The next prime is 239649829. The reversal of 239649819 is 918946932.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 239649819 - 2¹⁵ = 239617051 is a prime.

It is a super-2 number, since 2×239649819² = 114864071493465522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (239649829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39941634 + ... + 39941639.

It is an arithmetic number, because the mean of its divisors is an integer number (79883274).

Almost surely, 2^239649819 is an apocalyptic number.

239649819 is a deficient number, since it is larger than the sum of its proper divisors (79883277).

239649819 is an equidigital number, since it uses as much as digits as its factorization.

239649819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79883276.

The product of its digits is 839808, while the sum is 51.

The square root of 239649819 is about 15480.6272159755. The cubic root of 239649819 is about 621.1441057953.

The spelling of 239649819 in words is "two hundred thirty-nine million, six hundred forty-nine thousand, eight hundred nineteen".