1091408 has 10 divisors (see below), whose sum is σ = 2114634. Its totient is φ = 545696.

The previous prime is 1091401. The next prime is 1091411. The reversal of 1091408 is 8041901.

It can be written as a sum of positive squares in only one way, i.e., 868624 + 222784 = 932^2 + 472^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34091 + ... + 34122.

2^1091408 is an apocalyptic number.

It is an amenable number.

1091408 is a deficient number, since it is larger than the sum of its proper divisors (1023226).

1091408 is an equidigital number, since it uses as much as digits as its factorization.

1091408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68221 (or 68215 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1091408 is about 1044.7047429777. The cubic root of 1091408 is about 102.9585405139.

The spelling of 1091408 in words is "one million, ninety-one thousand, four hundred eight".