2439866491 has 4 divisors (see below), whose sum is σ = 2491778592. Its totient is φ = 2387954392.

The previous prime is 2439866489. The next prime is 2439866579. The reversal of 2439866491 is 1946689342.

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 2439866491 - 2¹ = 2439866489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2439866431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25955980 + ... + 25956073.

It is an arithmetic number, because the mean of its divisors is an integer number (622944648).

Almost surely, 2^2439866491 is an apocalyptic number.

2439866491 is a deficient number, since it is larger than the sum of its proper divisors (51912101).

2439866491 is an equidigital number, since it uses as much as digits as its factorization.

2439866491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51912100.

The product of its digits is 2239488, while the sum is 52.

The square root of 2439866491 is about 49395.0047170764. The cubic root of 2439866491 is about 1346.2385446008.

The spelling of 2439866491 in words is "two billion, four hundred thirty-nine million, eight hundred sixty-six thousand, four hundred ninety-one".