9904381 has 2 divisors, whose sum is σ = 9904382. Its totient is φ = 9904380.

The previous prime is 9904373. The next prime is 9904393. The reversal of 9904381 is 1834099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5924356 + 3980025 = 2434^2 + 1995^2 .

It is an emirp because it is prime and its reverse (1834099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9904381 - 2³ = 9904373 is a prime.

It is a super-2 number, since 2×9904381² = 196193525986322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9904331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4952190 + 4952191.

It is an arithmetic number, because the mean of its divisors is an integer number (4952191).

Almost surely, 2^9904381 is an apocalyptic number.

It is an amenable number.

9904381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9904381 is an equidigital number, since it uses as much as digits as its factorization.

9904381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 9904381 is about 3147.1226541080. The cubic root of 9904381 is about 214.7545856686.

The spelling of 9904381 in words is "nine million, nine hundred four thousand, three hundred eighty-one".