1991030 has 8 divisors (see below), whose sum is σ = 3583872. Its totient is φ = 796408.

The previous prime is 1991027. The next prime is 1991047. The reversal of 1991030 is 301991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1990987 and 1991005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99542 + ... + 99561.

It is an arithmetic number, because the mean of its divisors is an integer number (447984).

2^1991030 is an apocalyptic number.

1991030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1991030 is a deficient number, since it is larger than the sum of its proper divisors (1592842).

1991030 is a wasteful number, since it uses less digits than its factorization.

1991030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199110.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1991030 is about 1411.0386245599. The cubic root of 1991030 is about 125.8034644933.

The spelling of 1991030 in words is "one million, nine hundred ninety-one thousand, thirty".