1904669139 has 4 divisors (see below), whose sum is σ = 2539558856. Its totient is φ = 1269779424.

The previous prime is 1904669113. The next prime is 1904669141. The reversal of 1904669139 is 9319664091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9319664091 = 3 ⋅3106554697.

It is not a de Polignac number, because 1904669139 - 2¹¹ = 1904667091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1904669149) 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, 317444854 + ... + 317444859.

It is an arithmetic number, because the mean of its divisors is an integer number (634889714).

Almost surely, 2^1904669139 is an apocalyptic number.

1904669139 is a deficient number, since it is larger than the sum of its proper divisors (634889717).

1904669139 is an equidigital number, since it uses as much as digits as its factorization.

1904669139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634889716.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 1904669139 is about 43642.5152689439. The cubic root of 1904669139 is about 1239.5760645406.

The spelling of 1904669139 in words is "one billion, nine hundred four million, six hundred sixty-nine thousand, one hundred thirty-nine".