1381904 has 10 divisors (see below), whose sum is σ = 2677470. Its totient is φ = 690944.

The previous prime is 1381901. The next prime is 1381907. The reversal of 1381904 is 4091831.

It is an interprime number because it is at equal distance from previous prime (1381901) and next prime (1381907).

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 300304 = 1040^2 + 548^2 .

It is not an unprimeable number, because it can be changed into a prime (1381901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43169 + ... + 43200.

It is an arithmetic number, because the mean of its divisors is an integer number (267747).

2^1381904 is an apocalyptic number.

It is an amenable number.

1381904 is a deficient number, since it is larger than the sum of its proper divisors (1295566).

1381904 is an equidigital number, since it uses as much as digits as its factorization.

1381904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86377 (or 86371 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1381904 is about 1175.5441293291. The cubic root of 1381904 is about 111.3848073339.

The spelling of 1381904 in words is "one million, three hundred eighty-one thousand, nine hundred four".