1091970 has 48 divisors (see below), whose sum is σ = 3100032. Its totient is φ = 264480.

The previous prime is 1091957. The next prime is 1091983. The reversal of 1091970 is 791901.

It is an interprime number because it is at equal distance from previous prime (1091957) and next prime (1091983).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 439 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (64584).

2^1091970 is an apocalyptic number.

1091970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1550016).

1091970 is an abundant number, since it is smaller than the sum of its proper divisors (2008062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091970 is a wasteful number, since it uses less digits than its factorization.

1091970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 1091970 is about 1044.9736838792. The cubic root of 1091970 is about 102.9762096687.

The spelling of 1091970 in words is "one million, ninety-one thousand, nine hundred seventy".