1391128 has 8 divisors (see below), whose sum is σ = 2608380. Its totient is φ = 695560.

The previous prime is 1391119. The next prime is 1391129. The reversal of 1391128 is 8211931.

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

It is a super-2 number, since 2×1391128² = 3870474224768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86938 + ... + 86953.

2^1391128 is an apocalyptic number.

It is an amenable number.

1391128 is a deficient number, since it is larger than the sum of its proper divisors (1217252).

1391128 is a wasteful number, since it uses less digits than its factorization.

1391128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173897 (or 173893 counting only the distinct ones).

The product of its digits is 432, while the sum is 25.

The square root of 1391128 is about 1179.4608937985. The cubic root of 1391128 is about 111.6320835458.

The spelling of 1391128 in words is "one million, three hundred ninety-one thousand, one hundred twenty-eight".