2905438639 has 4 divisors (see below), whose sum is σ = 2922233256. Its totient is φ = 2888644024.

The previous prime is 2905438609. The next prime is 2905438643. The reversal of 2905438639 is 9368345092.

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 2905438639 - 2⁷ = 2905438511 is a prime.

It is a super-3 number, since 3×2905438639³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2905438592 and 2905438601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2905438609) 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, 8397049 + ... + 8397394.

It is an arithmetic number, because the mean of its divisors is an integer number (730558314).

Almost surely, 2^2905438639 is an apocalyptic number.

2905438639 is a deficient number, since it is larger than the sum of its proper divisors (16794617).

2905438639 is a wasteful number, since it uses less digits than its factorization.

2905438639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16794616.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 2905438639 is about 53902.1209137451. The cubic root of 2905438639 is about 1426.9340541047.

The spelling of 2905438639 in words is "two billion, nine hundred five million, four hundred thirty-eight thousand, six hundred thirty-nine".