1904129989 has 2 divisors, whose sum is σ = 1904129990. Its totient is φ = 1904129988.

The previous prime is 1904129963. The next prime is 1904130013. The reversal of 1904129989 is 9899214091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1778308900 + 125821089 = 42170^2 + 11217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904129989 - 2¹³ = 1904121797 is a prime.

It is a super-2 number, since 2×1904129989² = 7251422030018280242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1904129939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952064994 + 952064995.

It is an arithmetic number, because the mean of its divisors is an integer number (952064995).

Almost surely, 2^1904129989 is an apocalyptic number.

It is an amenable number.

1904129989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904129989 is an equidigital number, since it uses as much as digits as its factorization.

1904129989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 1904129989 is about 43636.3379421326. The cubic root of 1904129989 is about 1239.4590922555.

The spelling of 1904129989 in words is "one billion, nine hundred four million, one hundred twenty-nine thousand, nine hundred eighty-nine".