1391872 has 18 divisors (see below), whose sum is σ = 2778818. Its totient is φ = 695808.

The previous prime is 1391861. The next prime is 1391893. The reversal of 1391872 is 2781931.

It can be written as a sum of positive squares in only one way, i.e., 1218816 + 173056 = 1104^2 + 416^2 .

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, 2463 + ... + 2974.

2^1391872 is an apocalyptic number.

It is an amenable number.

1391872 is a deficient number, since it is larger than the sum of its proper divisors (1386946).

1391872 is an frugal number, since it uses more digits than its factorization.

1391872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453 (or 5439 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 1391872 is about 1179.7762499728. The cubic root of 1391872 is about 111.6519809404.

The spelling of 1391872 in words is "one million, three hundred ninety-one thousand, eight hundred seventy-two".