1391944 has 8 divisors (see below), whose sum is σ = 2609910. Its totient is φ = 695968.

The previous prime is 1391941. The next prime is 1391969. The reversal of 1391944 is 4491931.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 289444 = 1050^2 + 538^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1391941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86989 + ... + 87004.

2^1391944 is an apocalyptic number.

It is an amenable number.

1391944 is a deficient number, since it is larger than the sum of its proper divisors (1217966).

1391944 is a wasteful number, since it uses less digits than its factorization.

1391944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173999 (or 173995 counting only the distinct ones).

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

The square root of 1391944 is about 1179.8067638389. The cubic root of 1391944 is about 111.6539061184.

The spelling of 1391944 in words is "one million, three hundred ninety-one thousand, nine hundred forty-four".