1904179649 has 2 divisors, whose sum is σ = 1904179650. Its totient is φ = 1904179648.

The previous prime is 1904179631. The next prime is 1904179663. The reversal of 1904179649 is 9469714091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1350048049 + 554131600 = 36743^2 + 23540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1904179649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1904179597 and 1904179606.

It is not a weakly prime, because it can be changed into another prime (1904179699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952089824 + 952089825.

It is an arithmetic number, because the mean of its divisors is an integer number (952089825).

Almost surely, 2^1904179649 is an apocalyptic number.

It is an amenable number.

1904179649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904179649 is an equidigital number, since it uses as much as digits as its factorization.

1904179649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1904179649 is about 43636.9069595910. The cubic root of 1904179649 is about 1239.4698672558.

The spelling of 1904179649 in words is "one billion, nine hundred four million, one hundred seventy-nine thousand, six hundred forty-nine".