1399144 has 8 divisors (see below), whose sum is σ = 2623410. Its totient is φ = 699568.

The previous prime is 1399133. The next prime is 1399183. The reversal of 1399144 is 4419931.

It can be written as a sum of positive squares in only one way, i.e., 743044 + 656100 = 862^2 + 810^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 87439 + ... + 87454.

2^1399144 is an apocalyptic number.

It is an amenable number.

1399144 is a deficient number, since it is larger than the sum of its proper divisors (1224266).

1399144 is a wasteful number, since it uses less digits than its factorization.

1399144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174899 (or 174895 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 1399144 is about 1182.8541752896. The cubic root of 1399144 is about 111.8460896137.

The spelling of 1399144 in words is "one million, three hundred ninety-nine thousand, one hundred forty-four".