1389904 has 10 divisors (see below), whose sum is σ = 2692970. Its totient is φ = 694944.

The previous prime is 1389893. The next prime is 1389911. The reversal of 1389904 is 4099831.

It can be written as a sum of positive squares in only one way, i.e., 1098304 + 291600 = 1048^2 + 540^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1389904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43419 + ... + 43450.

It is an arithmetic number, because the mean of its divisors is an integer number (269297).

2^1389904 is an apocalyptic number.

It is an amenable number.

1389904 is a deficient number, since it is larger than the sum of its proper divisors (1303066).

1389904 is an equidigital number, since it uses as much as digits as its factorization.

1389904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86877 (or 86871 counting only the distinct ones).

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

The square root of 1389904 is about 1178.9418984836. The cubic root of 1389904 is about 111.5993336805.

The spelling of 1389904 in words is "one million, three hundred eighty-nine thousand, nine hundred four".