904781 has 2 divisors, whose sum is σ = 904782. Its totient is φ = 904780.

The previous prime is 904777. The next prime is 904789. The reversal of 904781 is 187409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 366025 = 734^2 + 605^2 .

It is an emirp because it is prime and its reverse (187409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 904781 - 2² = 904777 is a prime.

It is a super-2 number, since 2×904781² = 1637257315922, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 904781.

It is not a weakly prime, because it can be changed into another prime (904789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452390 + 452391.

It is an arithmetic number, because the mean of its divisors is an integer number (452391).

2⁹⁰⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

904781 is a deficient number, since it is larger than the sum of its proper divisors (1).

904781 is an equidigital number, since it uses as much as digits as its factorization.

904781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 904781 is about 951.1997687132. The cubic root of 904781 is about 96.7195997583.

The spelling of 904781 in words is "nine hundred four thousand, seven hundred eighty-one".