1904048639 has 4 divisors (see below), whose sum is σ = 1905785424. Its totient is φ = 1902311856.

The previous prime is 1904048611. The next prime is 1904048717. The reversal of 1904048639 is 9368404091.

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 1904048639 - 2⁸ = 1904048383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1904048639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1904048039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866747 + ... + 868940.

It is an arithmetic number, because the mean of its divisors is an integer number (476446356).

Almost surely, 2^1904048639 is an apocalyptic number.

1904048639 is a deficient number, since it is larger than the sum of its proper divisors (1736785).

1904048639 is a wasteful number, since it uses less digits than its factorization.

1904048639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736784.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1904048639 is about 43635.4057962109. The cubic root of 1904048639 is about 1239.4414408988.

The spelling of 1904048639 in words is "one billion, nine hundred four million, forty-eight thousand, six hundred thirty-nine".