1285904 has 10 divisors (see below), whose sum is σ = 2491470. Its totient is φ = 642944.

The previous prime is 1285903. The next prime is 1285913. The reversal of 1285904 is 4095821.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 204304 = 1040^2 + 452^2 .

It is not an unprimeable number, because it can be changed into a prime (1285903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40169 + ... + 40200.

It is an arithmetic number, because the mean of its divisors is an integer number (249147).

2^1285904 is an apocalyptic number.

It is an amenable number.

1285904 is a deficient number, since it is larger than the sum of its proper divisors (1205566).

1285904 is an equidigital number, since it uses as much as digits as its factorization.

1285904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80377 (or 80371 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1285904 is about 1133.9770720786. The cubic root of 1285904 is about 108.7433853378.

The spelling of 1285904 in words is "one million, two hundred eighty-five thousand, nine hundred four".