2804639 has 2 divisors, whose sum is σ = 2804640. Its totient is φ = 2804638.

The previous prime is 2804617. The next prime is 2804693. The reversal of 2804639 is 9364082.

Together with next prime (2804693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2804639 - 2⁸ = 2804383 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2804699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402319 + 1402320.

It is an arithmetic number, because the mean of its divisors is an integer number (1402320).

2^2804639 is an apocalyptic number.

2804639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2804639 is an equidigital number, since it uses as much as digits as its factorization.

2804639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2804639 is about 1674.7056457778. The cubic root of 2804639 is about 141.0237707857.

It can be divided in two parts, 2804 and 639, that added together give a palindrome (3443).

The spelling of 2804639 in words is "two million, eight hundred four thousand, six hundred thirty-nine".