1904043949 has 2 divisors, whose sum is σ = 1904043950. Its totient is φ = 1904043948.

The previous prime is 1904043919. The next prime is 1904043971. The reversal of 1904043949 is 9493404091.

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., 1773673225 + 130370724 = 42115^2 + 11418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904043949 - 2¹⁵ = 1904011181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1904043919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952021974 + 952021975.

It is an arithmetic number, because the mean of its divisors is an integer number (952021975).

Almost surely, 2^1904043949 is an apocalyptic number.

It is an amenable number.

1904043949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904043949 is an equidigital number, since it uses as much as digits as its factorization.

1904043949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 1904043949 is about 43635.3520554149. The cubic root of 1904043949 is about 1239.4404232453.

The spelling of 1904043949 in words is "one billion, nine hundred four million, forty-three thousand, nine hundred forty-nine".